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XScreenSaver(1) 								  XScreenSaver(1)

       xscreensaver - extensible screen saver framework, plus locking

       xscreensaver [-display host:display.screen] [-verbose] [-no-capture-stderr] [-no-splash]

       The  xscreensaver  program waits until the keyboard and mouse have been idle for a period,
       and then runs a graphics demo chosen at random.	It turns off as  soon  as  there  is  any
       mouse or keyboard activity.

       This  program  can lock your terminal in order to prevent others from using it, though its
       default mode of operation is merely to display pretty pictures on your screen when  it  is
       not in use.

       It also provides configuration and control of your monitor's power-saving features.

       For the impatient, try this:
       xscreensaver &
       The  xscreensaver-demo(1)  program pops up a dialog box that lets you configure the screen
       saver, and experiment with the various display modes.

       Note: unlike xlock(1), xscreensaver has a client-server model: the xscreensaver program is
       a  daemon  that	runs  in the background; it is controlled by the foreground xscreensaver-
       demo(1) and xscreensaver-command(1) programs.

       The easiest way to configure xscreensaver is to simply run the  xscreensaver-demo(1)  pro-
       gram,  and  change  the	settings through the GUI.  The rest of this manual page describes
       lower level ways of changing settings.

       Options to xscreensaver are stored in one of two places: in a .xscreensaver file  in  your
       home directory; or in the X resource database.  If the .xscreensaver file exists, it over-
       rides any settings in the resource database.

       The syntax of the .xscreensaver file is similar to that of the .Xdefaults file; for  exam-
       ple, to set the timeout paramter in the .xscreensaver file, you would write the following:
       timeout: 5
       whereas, in the .Xdefaults file, you would write
       xscreensaver.timeout: 5
       If  you	change a setting in the .xscreensaver file while xscreensaver is already running,
       it will notice this, and reload the file.  (The file will be reloaded the  next	time  the
       screen  saver  needs  to  take  some action, such as blanking or unblanking the screen, or
       picking a new graphics mode.)

       If you change a setting in your X resource database, or if you want xscreensaver to notice
       your  changes immediately instead of the next time it wakes up, then you will need to tell
       the running xscreensaver process to re-initialize itself, like so:
       xscreensaver-command -restart
       Note that if you changed the .Xdefaults file, you might also need to run xrdb(1):
       xrdb < ~/.Xdefaults
       If you want to set the system-wide defaults, then make your edits to the xscreensaver app-
       defaults  file,	which  should have been installed when xscreensaver itself was installed.
       The app-defaults file will usually be  named  /usr/lib/X11/app-defaults/XScreenSaver,  but
       different  systems  might keep it in a different place (for example, /usr/openwin/lib/app-
       defaults/XScreenSaver on Solaris.)

       When settings are changed in the Preferences dialog box (see above) the	current  settings
       will be written to the .xscreensaver file.  (The .Xdefaults file and the app-defaults file
       will never be written by xscreensaver itself.)

       timeout (class Time)
	       The screensaver will activate (blank the screen) after the keyboard and mouse have
	       been idle for this many minutes.  Default 10 minutes.

       cycle (class Time)
	       After  the  screensaver has been running for this many minutes, the currently run-
	       ning graphics-hack sub-process will be  killed  (with  SIGTERM),  and  a  new  one
	       started.   If  this  is	0, then the graphics hack will never be changed: only one
	       demo will run until the screensaver is deactivated by user activity.   Default  10

       lock (class Boolean)
	       Enable  locking: before the screensaver will turn off, it will require you to type
	       the password of the logged-in user (really, the person who ran  xscreensaver),  or
	       the  root  password.   (Note:  this doesn't work if the screensaver is launched by
	       xdm(1) because it can't know the user-id of the logged-in user.	See  the  ``Using
	       XDM(1)'' section, below.

       lockTimeout (class Time)
	       If  locking  is	enabled, this controls the length of the ``grace period'' between
	       when the screensaver activates, and when the screen becomes locked.  For  example,
	       if  this  is 5, and -timeout is 10, then after 10 minutes, the screen would blank.
	       If there was user activity at 12 minutes, no password would  be	required  to  un-
	       blank  the  screen.   But, if there was user activity at 15 minutes or later (that
	       is, -lock-timeout minutes after activation) then a  password  would  be	required.
	       The  default  is  0,  meaning  that if locking is enabled, then a password will be
	       required as soon as the screen blanks.

       passwdTimeout (class Time)
	       If the screen is locked, then this is how many seconds  the  password  dialog  box
	       should  be  left on the screen before giving up (default 30 seconds.)  This should
	       not be too large: the X server is grabbed for the duration that the password  dia-
	       log  box is up (for security purposes) and leaving the server grabbed for too long
	       can cause problems.

       dpmsEnabled (class Boolean)
	       Whether power management is enabled.

       dpmsStandby (class Time)
	       If power management is enabled, how long until the monitor goes solid black.

       dpmsSuspend (class Time)
	       If power management is enabled, how long until the monitor goes into  power-saving

       dpmsOff (class Time)
	       If power management is enabled, how long until the monitor powers down completely.
	       Note that these settings will have no effect unless both the X server and the dis-
	       play hardware support power management; not all do.  See the Power Management sec-
	       tion, below, for more information.

       visualID (class VisualID)
	       Specify which X visual to use by default.  (Note carefully that this  resource  is
	       called visualID, not merely visual; if you set the visual resource instead, things
	       will malfunction in obscure ways for obscure reasons.)

	       Legal values for the VisualID resource are:

	       default Use the screen's default visual (the visual of the root window.)  This  is
		       the default.

	       best    Use  the  visual  which supports the most colors.  Note, however, that the
		       visual with the most colors might be a TrueColor visual,  which	does  not
		       support	colormap animation.  Some programs have more interesting behavior
		       when run on PseudoColor visuals than on TrueColor.

	       mono    Use a monochrome visual, if there is one.

	       gray    Use a grayscale or staticgray visual, if there is one and it has more than
		       one plane (that is, it's not monochrome.)

	       color   Use the best of the color visuals, if there are any.

	       GL      Use  the  visual  that is best for OpenGL programs.  (OpenGL programs have
		       somewhat different requirements than other X programs.)

	       class   where class is one of StaticGray, StaticColor, TrueColor, GrayScale, Pseu-
		       doColor, or DirectColor.  Selects the deepest visual of the given class.

	       number  where  number  (decimal	or  hex) is interpreted as a visual id number, as
		       reported by the xdpyinfo(1) program; in this way you can have  finer  con-
		       trol  over  exactly which visual gets used, for example, to select a shal-
		       lower one than would otherwise have been chosen.

	       Note that this option specifies only the default visual that  will  be  used:  the
	       visual  used may be overridden on a program-by-program basis.  See the description
	       of the programs resource, below.

       installColormap (class Boolean)
	       Install a private colormap while the screensaver is active, so that  the  graphics
	       hacks  can  get	as  many  colors  as  possible.  This is the default.  (This only
	       applies when the screen's default visual is being used, since non-default  visuals
	       get their own colormaps automatically.)	This can also be overridden on a per-hack
	       basis: see the discussion of the default-n name in the section about the  programs

       verbose (class Boolean)
	       Whether to print diagnostics.  Default false.

       timestamp (class Boolean)
	       Whether	to  print  the	time  of  day  along  with any other diagnostic messages.
	       Default false.

       splash (class Boolean)
	       Whether to display a splash screen at startup.  Default true.

       splashDuration (class Time)
	       How long the splash screen should remain visible; default 5 seconds.

       helpURL (class URL)
	       The splash screen has a Help button on it.  When you press it, it will display the
	       web page indicated here in your web browser.

       loadURL (class LoadURL)
	       This  is  the shell command used to load a URL into your web browser.  The default
	       setting will load it into Netscape if  it  is  already  running,  otherwise,  will
	       launch a new Netscape looking at the helpURL.

       demoCommand (class DemoCommand)
	       This  is  the  shell  command  run  when  the  Demo button on the splash window is
	       pressed.  It defaults to xscreensaver-demo.

       prefsCommand (class PrefsCommand)
	       This is the shell command run when the  Prefs  button  on  the  splash  window  is
	       pressed.  It defaults to xscreensaver-demo -prefs.

       nice (class Nice)
	       The sub-processes created by xscreensaver will be ``niced'' to this level, so that
	       they are given lower priority than  other  processes  on  the  system,  and  don't
	       increase the load unnecessarily.  The default is 10.

	       (Higher numbers mean lower priority; see nice(1) for details.)

       memoryLimit (class MemoryLimit)
	       The  sub-processes  created  by	xscreensaver will not be allowed to allocate more
	       than this much memory (more accurately, this is the  maximum  size  their  address
	       space may become.)  If any sub-process tries to allocate more than this, malloc(3)
	       will fail, and the process will likely exit (or safely crash)  rather  than  going
	       forth and hogging memory.

	       The  assumption	here  is that if one of the screenhacks is trying to use a lot of
	       memory, then something has gone wrong, and it's better to kill that  program  than
	       to overload the machine.

	       Default:  0,  meaning  "no  limit."   30M  is a good choice on most systems.  (But
	       beware that setting this to a small value can cause OpenGL programs to malfunction
	       on certain systems.)

       fade (class Boolean)
	       If  this is true, then when the screensaver activates, the current contents of the
	       screen will fade to black instead of simply winking out.  This only works on  cer-
	       tain  systems.	A  fade will also be done when switching graphics hacks (when the
	       cycle timer expires.)  Default: true.

       unfade (class Boolean)
	       If this is true, then when the screensaver deactivates, the original  contents  of
	       the  screen  will  fade in from black instead of appearing immediately.	This only
	       works on certain systems, and if fade is true as well.  Default false.

       fadeSeconds (class Time)
	       If fade is true, this is how long the fade will be in seconds (default 3 seconds.)

       fadeTicks (class Integer)
	       If fade is true, this is how many times a second the colormap will be  changed  to
	       effect  a  fade.  Higher numbers yield smoother fades, but may make the fades take
	       longer than the specified fadeSeconds if your server isn't fast enough to keep up.
	       Default 20.

       captureStderr (class Boolean)
	       Whether	xscreensaver  should redirect its stdout and stderr streams to the window
	       itself.	Since its nature is to take over the screen, you would not  normally  see
	       error  messages	generated  by  xscreensaver  or  the  sub-programs  it runs; this
	       resource will cause the output of all relevant programs to be drawn on the screen-
	       saver  window  itself, as well as being written to the controlling terminal of the
	       screensaver driver process.  Default true.

       ignoreUninstalledPrograms (class Boolean)
	       There may be programs in the list that are not installed on the	system,  yet  are
	       marked  as  "enabled."  If this preference is true, then such programs will simply
	       be ignored.  If false, then a warning will be printed if an attempt is made to run
	       the nonexistent program.  Also, the xscreensaver-demo(1) program will suppress the
	       non-existent programs from the list if this is true.  Default: false.

       font (class Font)
	       The font used for the stdout/stderr  text,  if  captureStderr  is  true.   Default
	       *-medium-r-*-140-*-m-* (a 14 point fixed-width font.)

       mode (class Mode)
	       Controls the behavior of xscreensaver.  Legal values are:

	       random  When  blanking  the  screen, select a random display mode from among those
		       that are enabled and applicable.  This is the default.

	       one     When blanking the screen, only ever use one particular display  mode  (the
		       one indicated by the selected setting.)

	       blank   When blanking the screen, just go black: don't run any graphics hacks.

	       off     Don't  ever  blank  the	screen, and don't ever allow the monitor to power

       selected (class Integer)
	       When mode is set to one, this is the one, indicated by its index in  the  programs
	       list.   You're  crazy  if you count them and set this number by hand: let xscreen-
	       saver-demo(1) do it for you!

       programs (class Programs)
	       The graphics hacks which xscreensaver runs when the user is idle.   The	value  of
	       this resource is a string, one sh-syntax command per line.  Each line must contain
	       exactly one command: no semicolons, no ampersands.

	       When the screensaver starts up, one of these  is  selected  at  random,	and  run.
	       After the cycle period expires, it is killed, and another is selected and run.

	       If  a  line  begins  with  a dash (-) then that particular program is disabled: it
	       won't be selected at random (though you can still select it explicitly  using  the
	       xscreensaver-demo(1) program.)

	       If  all	programs  are  disabled, then the screen will just be made blank, as when
	       mode is set to blank.

	       To disable a program, you must mark it as disabled with a dash instead of removing
	       it  from  the  list.   This is because the system-wide (app-defaults) and per-user
	       (.xscreensaver) settings are merged together, and if a user just deletes an  entry
	       from  their  programs  list,  but that entry still exists in the system-wide list,
	       then it will come back.	However, if the user  disables	it,  then  their  setting
	       takes precedence.

	       If the display has multiple screens, then a different program will be run for each
	       screen.	(All screens are blanked and unblanked simultaniously.)

	       Note that you must escape the newlines; here is an example of how  you  might  set
	       this in your ~/.xscreensaver file:

	       programs:  \
		      qix -root 			 \n\
		      ico -r -faces -sleep 1 -obj ico	 \n\
		      xdaliclock -builtin2 -root	 \n\
		      xv -root -rmode 5 image.gif -quit  \n
	       Make  sure your $PATH environment variable is set up correctly before xscreensaver
	       is launched, or it won't be able to find  the  programs	listed	in  the  programs

	       To use a program as a screensaver, two things are required: that that program draw
	       on the root window (or be able to be configured to draw on the root  window);  and
	       that  that  program understand ``virtual root'' windows, as used by virtual window
	       managers such as tvtwm(1).  (Generally, this is accomplished by just including the
	       "vroot.h" header file in the program's source.)

	       If  there  are some programs that you want to run only when using a color display,
	       and others that you want to run only when using	a  monochrome  display,  you  can
	       specify that like this:
		      mono:   mono-program  -root	 \n\
		      color:  color-program -root	 \n\
	       More  generally,  you  can  specify the kind of visual that should be used for the
	       window on which the program will be drawing.  For example, if  one  program  works
	       best  if it has a colormap, but another works best if it has a 24-bit visual, both
	       can be accommodated:
		      PseudoColor: cmap-program  -root	 \n\
		      TrueColor:   24bit-program -root	 \n\
	       In addition to the symbolic visual names described above (in the discussion of the
	       visualID resource) one other visual name is supported in the programs list:

		    This  is  like  default,  but  also requests the use of the default colormap,
		    instead of a private colormap.  (That is, it behaves as  if  the  -no-install
		    command-line  option was specified, but only for this particular hack.)  This
		    is provided because some third-party programs that draw on	the  root  window
		    (notably:  xv(1),  and  xearth(1)) make assumptions about the visual and col-
		    ormap of the root window: assumptions which xscreensaver can violate.

	       If you specify a particular visual for a program, and that visual does  not  exist
	       on  the	screen,  then that program will not be chosen to run.  This means that on
	       displays with multiple screens of different depths, you can arrange for	appropri-
	       ate hacks to be run on each.  For example, if one screen is color and the other is
	       monochrome, hacks that look good in mono can be run on one, and	hacks  that  only
	       look good in color will show up on the other.

       Normally you won't need to change the following resources:

       pointerPollTime (class Time)
	       When  server  extensions are not in use, this controls how frequently xscreensaver
	       checks to see if the mouse position or buttons have changed.  Default 5 seconds.

       windowCreationTimeout (class Time)
	       When server extensions are not in use, this controls the delay between  when  win-
	       dows  are  created  and when xscreensaver selects events on them.  Default 30 sec-

       initialDelay (class Time)
	       When server extensions are not in use, xscreensaver will wait  this  many  seconds
	       before  selecting  events  on existing windows, under the assumption that xscreen-
	       saver is started during your login procedure, and the window state may be in flux.
	       Default	0.   (This used to default to 30, but that was back in the days when slow
	       machines and X terminals were more common...)

       sgiSaverExtension (class Boolean)
	       There are a number of different X server extensions which can make  xscreensaver's
	       job  easier.   The  next  few resources specify whether these extensions should be
	       utilized if they are available.

	       This resource controls whether the SGI SCREEN_SAVER server extension will be  used
	       to  decide whether the user is idle.  This is the default if xscreensaver has been
	       compiled with support for this extension (which is the default on  SGI  systems.).
	       If  it is available, the SCREEN_SAVER method is faster and more reliable than what
	       will be done otherwise, so use it if you can.  (This extension is  only	available
	       on Silicon Graphics systems, unfortunately.)

       mitSaverExtension (class Boolean)
	       This  resource controls whether the MIT-SCREEN-SAVER server extension will be used
	       to decide whether the user is idle.  However, the default  for  this  resource  is
	       false, because even if this extension is available, it is flaky (and it also makes
	       the fade option not work properly.)  Use of this extension is not recommended.

       xidleExtension (class Boolean)
	       This resource controls whether the XIDLE server extension will be used  to  decide
	       whether	the  user is idle.  This is the default if xscreensaver has been compiled
	       with support for this extension.  (This extension is only available for X11R4  and
	       X11R5 systems, unfortunately.)

       procInterrupts (class Boolean)
	       This  resource  controls  whether the /proc/interrupts file should be consulted to
	       decide whether the user is idle.  This is the default  if  xscreensaver	has  been
	       compiled on a system which supports this mechanism (i.e., Linux systems.)

	       The  benefit  to  doing this is that xscreensaver can note that the user is active
	       even when the X console is not the active one: if the user is  typing  in  another
	       virtual	console,  xscreensaver	will  notice that and will fail to activate.  For
	       example, if you're playing Quake in VGA-mode, xscreensaver won't wake  up  in  the
	       middle of your game and start competing for CPU.

	       The  drawback  to  doing this is that perhaps you really do want idleness on the X
	       console to cause the X display to lock, even if there is activity on other virtual
	       consoles.   If  you want that, then set this option to False.  (Or just lock the X
	       console manually.)

	       The default value for this resource is True, on systems where it works.

       overlayStderr (class Boolean)
	       If captureStderr is True, and your server supports ``overlay'' visuals,	then  the
	       text  will be written into one of the higher layers instead of into the same layer
	       as the running screenhack.   Set  this  to  False  to  disable  that  (though  you
	       shouldn't need to.)

       overlayTextForeground (class Foreground)
	       The  foreground	color  used for the stdout/stderr text, if captureStderr is true.
	       Default: Yellow.

       overlayTextBackground (class Background)
	       The background color used for the stdout/stderr text, if  captureStderr	is  true.
	       Default: Black.

       bourneShell (class BourneShell)
	       The pathname of the shell that xscreensaver uses to start subprocesses.	This must
	       be whatever your local variant of /bin/sh is: in particular, it must not be csh.

       xscreensaver also accepts a few command-line options, mostly for use when  debugging:  for
       normal operation, you should configure things via the ~/.xscreensaver file.

       -display host:display.screen
	       The  X display to use.  For displays with multiple screens, XScreenSaver will man-
	       age all screens on the display simultaniously.

	       Same as setting the verbose resource to true: print diagnostics on stderr  and  on
	       the xscreensaver window.

	       Same  as  setting  the captureStderr resource to false: do not redirect the stdout
	       and stderr streams to the xscreensaver window itself.  If xscreensaver  is  crash-
	       ing, you might need to do this in order to see the error message.

       When it is time to activate the screensaver, a full-screen black window is created on each
       screen of the display.  Each window is created in such a way that,  to  any  subsequently-
       created	programs,  it  will appear to be a ``virtual root'' window.  Because of this, any
       program which draws on the root window (and which understands virtual roots) can  be  used
       as a screensaver.

       When  the user becomes active again, the screensaver windows are unmapped, and the running
       subprocesses are killed by sending them SIGTERM.  This is also how  the	subprocesses  are
       killed when the screensaver decides that it's time to run a different demo: the old one is
       killed and a new one is launched.

       Before launching a subprocess, xscreensaver stores an appropriate value	for  $DISPLAY  in
       the  environment  that the child will receive.  (This is so that if you start xscreensaver
       with a -display argument, the programs which xscreensaver launches will draw on	the  same
       display;  and  so that the child will end up drawing on the appropriate screen of a multi-
       headed display.)

       When the screensaver turns off, or is killed, care is taken to restore the  ``real''  vir-
       tual  root window if there is one.  Because of this, it is important that you not kill the
       screensaver process with kill -9 if you are running a virtual-root window manager.  If you
       kill  it  with -9, you may need to restart your window manager to repair the damage.  This
       isn't an issue if you aren't running a virtual-root window manager.

       For all the gory details, see the commentary at the top of xscreensaver.c.

       You can control a running screensaver process by using the xscreensaver-command(1) program
       (which see.)

       Modern  X  servers contain support to power down the monitor after an idle period.  If the
       monitor has powered down, then xscreensaver will notice this (after a  few  minutes),  and
       will  not  waste CPU by drawing graphics demos on a black screen.  An attempt will also be
       made to explicitly power the monitor back up as soon as user activity is detected.

       As of version 3.28, the ~/.xscreensaver file controls the configuration of your	display's
       power  management  settings: if you have used xset(1) to change your power management set-
       tings, then xscreensaver  will  override  those	changes  with  the  values  specified  in
       ~/.xscreensaver (or with its built-in defaults, if there is no ~/.xscreensaver file yet.)

       To  change your power management settings, run xscreensaver-demo(1) and change the various
       timeouts through the user interface.  Alternately, you can edit the  ~/.xscreensaver  file

       If  the	power  management section is grayed out in the xscreensaver-demo(1) window,  then
       that means that your X server does not support the XDPMS extension, and	so  control  over
       the monitor's power state is not available.

       If  you're using a laptop, don't be surprised if changing the DPMS settings has no effect:
       many laptops have monitor power-saving behavior built in at  a  very  low  level  that  is
       invisible  to  Unix  and  X.   On  such systems, you can typically adjust the power-saving
       delays only by changing settings in the BIOS in some hardware-specific way.

       If DPMS seems not to be working with XFree86, make sure the "DPMS" option is set  in  your
       /etc/X11/XF86Config file.  See the XF86Config(5) manual for details.

       You  can  run xscreensaver from your xdm(1) session, so that the screensaver will run even
       when nobody is logged in on the console.

       The trick to using xscreensaver with xdm is this: keep in  mind	the  two  very	different
       states in which xscreensaver will be running:

	   1: Nobody logged in.

	      If  you're  thinking  of	running  xscreensaver from XDM at all, then it's probably
	      because you want graphics demos to be running on the console when nobody is  logged
	      in  there.   In this case, xscreensaver will function only as a screen saver, not a
	      screen locker: it doesn't make sense for xscreensaver to	lock  the  screen,  since
	      nobody is logged in yet!	The only thing on the screen is the XDM login prompt.

	   2: Somebody logged in.

	      Once someone has logged in through the XDM login window, the situation is very dif-
	      ferent.  For example: now it makes sense to lock the screen  (and  prompt  for  the
	      logged  in  user's  password);  and  now	xscreensaver  should  consult that user's
	      ~/.xscreensaver file; and so on.

       The difference between these two states comes down to a question of,  which  user  is  the
       xscreensaver  process  running  as?  For the first state, it doesn't matter.  If you start
       xscreensaver in the usual XDM way, then xscreensaver will probably end up running as root,
       which is fine for the first case (the ``nobody logged in'' case.)

       However,  once  someone	is logged in, running as root is no longer fine: because xscreen-
       saver will be consulting root's .xscreensaver file instead of that of the logged in  user,
       and won't be prompting for the logged in user's password, and so on.  (This is not a secu-
       rity problem, it's just not what you want.)

       So, once someone has logged in, you want xscreensaver to be running as that user.  The way
       to accomplish this is to kill the old xscreensaver process and start a new one (as the new

       The simplest way to accomplish all of this is as follows:

	   1: Launch xscreensaver before anyone logs in.

	      To the file /usr/lib/X11/xdm/Xsetup, add the lines
	      xhost +localhost
	      xscreensaver-command -exit
	      xscreensaver &
	      This will run xscreensaver as root, over the XDM login window.   Moving  the  mouse
	      will cause the screen to un-blank, and allow the user to type their password at XDM
	      to log in.

	   2: Restart xscreensaver when someone logs in.

	      Near the top of the file /usr/lib/X11/xdm/Xsession, add those same lines:
	      xscreensaver-command -exit
	      xscreensaver &
	      When someone logs in, this will kill off the existing (root) xscreensaver  process,
	      and  start  a  new  one, running as the user who has just logged in.  If the user's
	      .xscreensaver file requests locking, they'll get it.  They will also get their  own
	      choice of timeouts, and graphics demos, and so on.

	      Alternately,  each  user	could  just put those lines in their personal ~/.xsession

       Make sure you have $PATH set up correctly in the Xsetup and Xsession scripts, or xdm won't
       be  able  to  find  xscreensaver,  and/or  xscreensaver won't be able to find its graphics

       (If your system does not seem to be executing the Xsetup file, you may need  to	configure
       it to do so: the traditional way to do this is to make that file the value of the Display-
       Manager*setup resource in the /usr/lib/X11/xdm/xdm-config file.	 See  the  man	page  for
       xdm(1) for more details.)

       It is safe to run xscreensaver as root (as xdm is likely to do.)  If run as root, xscreen-
       saver changes its effective user and group ids to something safe  (like	"nobody")  before
       connecting to the X server or launching user-specified programs.

       An unfortunate side effect of this (important) security precaution is that it may conflict
       with cookie-based authentication.

       If you get "connection refused" errors when running xscreensaver from xdm, then this prob-
       ably  means  that  you  have xauth(1) or some other security mechanism turned on.  One way
       around this is to add "xhost +localhost" to Xsetup, just before xscreensaver is launched.

       Note that this will give access to the X server to anyone capable of  logging  in  to  the
       local  machine,	so  in	some environments, this might not be appropriate.  If turning off
       file-system-based access control is not acceptable, then  running  xscreensaver	from  the
       Xsetup  file might not be possible, and xscreensaver will only work when running as a nor-
       mal, unprivileged user.

       For more information on the X server's access control mechanisms, see the  man  pages  for
       X(1), Xsecurity(1), xauth(1), and xhost(1).

       Using  xscreensaver  with gdm(1) is easy, because gdm has a configuration tool.	Just fire
       up gdmconfig(1) and on the Background page, type "xscreensaver -nosplash" into  the  Back-
       ground  Program field.  That will cause gdm to run xscreensaver while nobody is logged in,
       and kill it as soon as someone does log in.  (The user will then be responsible for start-
       ing xscreensaver on their own, if they want.)

       In  this  situation, the xscreensaver process will probably be running as user gdm instead
       of root.  You can configure the settings for this nobody-logged-in state (timeouts,  DPMS,
       etc.) by editing the ~gdm/.xscreensaver file.

       The  easiest  way  to  use  xscreensaver  on a system with CDE is to simply switch off the
       built-in CDE screensaver, and use xscreensaver instead; and  second,  to  tell  the  front
       panel to run xscreensaver-command(1) with the -lock option when the Lock icon is clicked.

       To accomplish this involves five steps:

	   1: Switch off CDE's locker
	      Do  this	by  turning off ``Screen Saver and Screen Lock'' in the Screen section of
	      the Style Manager.

	   2: Edit sessionetc
	      Edit the file ~/.dt/sessions/sessionetc and add to it the line
	      xscreensaver &
	      And make sure the sessionetc file is executable.	This will cause  xscreensaver  to
	      be  launched  when  you  log  in.   (As always, make sure that xscreensaver and the
	      graphics demos are on your $PATH; the path needs to be set in .cshrc and/or .dtpro-
	      file, not .login.)

	   3: Create XScreenSaver.dt
	      Create a file called ~/.dt/types/XScreenSaver.dt with the following contents:
	      ACTION XScreenSaver
		LABEL	      XScreenSaver
		EXEC_STRING   xscreensaver-command -lock
		ICON	      Dtkey
	      This  defines a ``lock'' command for the CDE front panel, that knows how to talk to

	   4: Create Lock.fp
	      Create a file called ~/.dt/types/Lock.fp with the following contents:
	      CONTROL Lock
		TYPE		 icon
		ICON		 Fplock
		LABEL		 Lock
		PUSH_ACTION	 XScreenSaver
	      This associates the CDE front panel ``Lock'' icon with the  lock	command  we  just
	      defined in step 3.

	   5: Restart
	      Select  ``Restart Workspace Manager'' from the popup menu to make your changes take
	      effect.  If things seem not to be working, check the file ~/.dt/errorlog for  error

       Since  CDE  is  a descendant of VUE, the instructions for using xscreensaver under VUE are
       similar to the above:

	   1: Switch off VUE's locker
	      Open the ``Style Manager'' and select ``Screen.''   Turn	off  ``Screen  Saver  and
	      Screen Lock'' option.

	   2: Make sure you have a Session
	      Next,  go  to the Style Manager's, ``Startup'' page.  Click on ``Set Home Session''
	      to create a session, then on ``Return to Home Session'' to select this session each
	      time you log in.

	   3: Edit vue.session
	      Edit the file ~/.vue/sessions/home/vue.session and add to it the line
	      vuesmcmd -screen 0 -cmd "xscreensaver"
	      This will cause xscreensaver to be launched when you log in.  (As always, make sure
	      that xscreensaver and the graphics demos are on your $PATH; the path  needs  to  be
	      set in .cshrc and/or .profile, not .login.)

	   3: Edit vuewmrc
	      Edit the file ~/.vue/vuewmrc and add (or change) the Lock control:
	      CONTROL Lock
		TYPE	     button
		IMAGE	     lock
		PUSH_ACTION  f.exec "xscreensaver-command -lock"
	      This  associates	the VUE front panel ``Lock'' icon with the xscreensaver lock com-

       I understand that KDE has invented their own wrapper around xscreensaver, that is inferior
       to  xscreensaver-demo(1) in any number of ways.	I've never actually seen it, but I'm told
       that this is the way you disable it:

	   1: Switch off KDE's screen saver.
	      Open the ``Control Center'' and select the ``Look and Feel  /  Screensaver''  page.
	      Turn off the ``Enable Screensaver'' checkbox.

	   2: Find your Autostart directory.
	      Open  the ``Look and Feel / Desktop / Paths'' page, and see what your ``Autostart''
	      directory is set to: it will probably be ~/.kde3/Autostart/ or something similar.

	   3: Make xscreensaver be an Autostart program.
	      Create a file in your autostart directory called xscreensaver.desktop that contains
	      the following five lines:
	      [Desktop Entry]

       Now  use  xscreensaver  normally,  controlling  it  via the usual xscreensaver-demo(1) and
       xscreensaver-command(1) mechanisms.

       The xscreensaver-command(1) program is a perfect candidate for something to  add  to  your
       window  manager's  popup  menus.  If you use mwm(1), 4Dwm(1), twm(1), or (probably) any of
       twm's many descendants, you can do it like this:

       1. Create ~/.mwmrc (or ~/.twmrc or ...)
	  If you don't have a ~/.mwmrc file (or, on SGIs, a  ~/.4Dwmrc	file;  or,  with  twm,	a
	  ~/.twmrc  file)  then create one by making a copy of the /usr/lib/X11/system.mwmrc file
	  (or /usr/lib/X11/twm/system.twmrc, and so on.)

       2. Add a menu definition.
	  Something like this:
	  menu XScreenSaver
	   "Blank Screen Now" !"sleep 3; xscreensaver-command -activate"
	   "Lock Screen Now"  !"sleep 3; xscreensaver-command -lock"
	   "Screen Saver Demo"	       !"xscreensaver-demo"
	   "Screen Saver Preferences"  !"xscreensaver-demo -prefs"
	   "Reinitialize Screen Saver" !"xscreensaver-command -restart"
	   "Kill Screen Saver"	       !"xscreensaver-command -exit"
	   "Launch Screen Saver"       !"xscreensaver &"

       3. Add the menu
	  For mwm(1) and 4Dwm(1), find the section of the file that  says  Menu  DefaultRootMenu.
	  For  twm(1),	it  will  probably be menu "defops".  If you add a line somewhere in that
	  menu definition that reads
	    "XScreenSaver"	  f.menu XScreenSaver
	  then this will add an XScreenSaver sub-menu to your  default	root-window  popup  menu.
	  Alternately,	you  could  just  put  the xscreensaver menu items directly into the root

       For Fvwm2, the process is similar: first create a ~/.fvwm2rc file  if  you  don't  already
       have  one,  by  making a copy of the /etc/X11/fvwm2/system.fvwm2rc file.  Then, add a menu
       definition to it:
       AddToMenu XScreenSaver "XScreenSaver" Title
       + "Blank Screen Now"	     Exec xscreensaver-command -activate
       + "Lock Screen Now"	     Exec xscreensaver-command -lock
       + "Screen Saver Demo"	     Exec xscreensaver-command -demo
       + "Screen Saver Preferences"  Exec xscreensaver-command -prefs
       + "Reinitialize Screen Saver" Exec xscreensaver-command -restart
       + "Kill Screen Saver"	     Exec xscreensaver-command -exit
       + "Launch Screen Saver"	     Exec xscreensaver
       + "Run Next Demo"	     Exec xscreensaver-command -next
       + "Run Previous Demo"	     Exec xscreensaver-command -prev

       # To put the XScreenSaver sub-menu at the end of the root menu:
       AddToMenu RootMenu "XScreenSaver" Popup XScreenSaver
       The Enlightenment window manager keeps each of its menus in a separate file. So, you  need
       to create a file named ~/.enlightenment/xscreensaver.menu with the contents:
       "XScreenSaver Commands"
	"Blank Screen Now"    NULL exec "xscreensaver-command -activate"
	"Lock Screen Now"     NULL exec "xscreensaver-command -lock"
	"Screen Saver Demo"   NULL exec "xscreensaver-command -demo"
	"Screen Saver Prefs"  NULL exec "xscreensaver-command -prefs"
	"Reinitialize Saver"  NULL exec "xscreensaver-command -restart"
	"Kill Screen Saver"   NULL exec "xscreensaver-command -exit"
	"Launch Screen Saver" NULL exec "xscreensaver"
       then add
	"XScreenSaver"	      NULL menu "xscreensaver.menu"
       to  ~/.enlightenment/file.menu  to  put the XScreenSaver submenu on your left-button root-
       window menu.

       As you see, every window manager does this stuff gratuitously differently,  just  to  make
       your life difficult.  You are in a maze of twisty menu configuration languages, all alike.

       Bugs?   There  are  no  bugs.   Ok,  well,  maybe.   If	you find one, please let me know.
       http://www.jwz.org/xscreensaver/bugs.html explains how to construct the	most  useful  bug

       Locking and XDM
	       If  xscreensaver  has  been  launched from xdm(1) before anyone has logged in, you
	       will need to kill and then restart the xscreensaver daemon after you  have  logged
	       in, or you will be confused by the results.  (For example, locking won't work, and
	       your ~/.xscreensaver file will be ignored.)

	       When you are logged in, you want the xscreensaver daemon to be running under  your
	       user id, not as root or some other user.

	       If it has already been started by xdm, you can kill it by sending it the exit com-
	       mand, and then re-launching it as you, by putting something like the following  in
	       your personal X startup script:
	       xscreensaver-command -exit
	       xscreensaver &
	       The  ``Using  XDM(1)''  section, above, goes into more detail, and explains how to
	       configure the system to do this for all users automatically.

       Locking and root logins
	       In order for it to be safe for xscreensaver to be launched by xdm, certain precau-
	       tions  had  to be taken, among them that xscreensaver never runs as root.  In par-
	       ticular, if it is launched as root (as xdm is likely  to  do),  xscreensaver  will
	       disavow its privileges, and switch itself to a safe user id (such as nobody.)

	       An  implication of this is that if you log in as root on the console, xscreensaver
	       will refuse to lock the screen (because it can't tell the difference between  root
	       being  logged  in on the console, and a normal user being logged in on the console
	       but xscreensaver having been launched by the xdm(1) Xsetup file.)

	       The solution to this is simple: you shouldn't be logging in on the console as root
	       in the first place!  (What, are you crazy or something?)

	       Proper Unix hygiene dictates that you should log in as yourself, and su(1) to root
	       as necessary.  People who spend their day logged in as root are just  begging  for

       XAUTH and XDM
	       For  xscreensaver  to  work when launched by xdm(1), programs running on the local
	       machine as user "nobody" must be able to connect to the X server.  This means that
	       if  you want to run xscreensaver on the console while nobody is logged in, you may
	       need to disable cookie-based access control (and allow all users who can log in to
	       the local machine to connect to the display.)

	       You  should  be	sure  that  this is an acceptable thing to do in your environment
	       before doing it.  See the ``Using XDM(1)'' section, above, for more details.

	       If anyone has suggestions on how xscreensaver could be made to  work  with  xdm(1)
	       without first turning off .Xauthority-based access control, please let me know.

	       If you get an error message at startup like ``couldn't get password of user'' then
	       this probably means that you're on a system in which the getpwent(3) library  rou-
	       tine can only be effectively used by root.  If this is the case, then xscreensaver
	       must be installed as setuid to root in order for locking to work.  Care	has  been
	       taken to make this a safe thing to do.

	       It  also  may  mean that your system uses shadow passwords instead of the standard
	       getpwent(3) interface; in that case, you may need to change some options with con-
	       figure and recompile.

	       If you change your password after xscreensaver has been launched, it will continue
	       using your old password to unlock the screen until xscreensaver is restarted.  So,
	       after you change your password, you'll have to do
	       xscreensaver-command -restart
	       to make xscreensaver notice.

       PAM Passwords
	       If  your  system  uses  PAM  (Pluggable Authentication Modules), then in order for
	       xscreensaver to use PAM properly,  PAM  must  be  told  about  xscreensaver.   The
	       xscreensaver  installation process should update the PAM data (on Linux, by creat-
	       ing the file /etc/pam.d/xscreensaver for you, and on Solaris, by telling you  what
	       lines to add to the /etc/pam.conf file.)

	       If  the	PAM configuration files do not know about xscreensaver, then you might be
	       in a situation where xscreensaver will refuse to ever unlock the screen.

	       This is a design flaw in PAM (there is no way for a client to tell the  difference
	       between	PAM  responding  ``I  have  never heard of your module,'' and responding,
	       ``you typed the wrong password.'')  As far as I can tell,  there  is  no  way  for
	       xscreensaver  to automatically work around this, or detect the problem in advance,
	       so if you have PAM, make sure it is configured correctly!

       Colormap lossage: TWM
	       The installColormap option doesn't work very well with the twm(1)  window  manager
	       and its descendants.

	       There  is  a race condition between the screensaver and this window manager, which
	       can result in the screensaver's colormap not getting installed  properly,  meaning
	       the  graphics hacks will appear in essentially random colors.  (If the screen goes
	       white instead of black, this is probably why.)

	       The mwm(1) and olwm(1) window managers don't have this problem.	The  race  condi-
	       tion  exists because X (really, ICCCM) does not provide a way for an OverrideRedi-
	       rect window to have its own colormap, short of grabbing the server (which is  nei-
	       ther  a	good idea, nor really possible with the current design.)  What happens is
	       that, as soon as xscreensaver installs its colormap, twm responds to the resultant
	       ColormapNotify  event  by  re-instaling	the  default  colormap.   Apparently, twm
	       doesn't always do this; it seems to do it regularly if the  screensaver	is  acti-
	       vated  from a menu item, but seems to not do it if the screensaver comes on of its
	       own volition, or is activated from another console.

	       Attention, window manager authors!
		   You should only call XInstallColormap(3) in response to user events.  That is,
		   it  is  appropriate	to  install  a colormap in response to FocusIn, FocusOut,
		   EnterNotify, and LeaveNotify events; but it is not appropriate to call  it  in
		   response  to  ColormapNotify  events.  If you install colormaps in response to
		   application actions as well as in response to user actions,	then  you  create
		   the	situation where it is impossible for override-redirect applications (such
		   as xscreensaver) to display their windows in the proper colors.

       Colormap lossage: XV, XAnim, XEarth
	       Some programs don't operate properly on visuals other than  the	default  one,  or
	       with  colormaps	other  than  the  default  one.   See the discussion of the magic
	       "default-n" visual name in the description of the programs resource in the Config-
	       uration	section.   When programs only work with the default colormap, you need to
	       use a syntax like this:
		  default-n: xv -root image-1.gif -quit  \n\
		  default-n: xearth -nostars -wait 0	 \n\
	       It would also work to turn off the installColormap  option  altogether,	but  that
	       would deny extra colors to those programs that can take advantage of them.

       Machine Load
	       Although  this  program ``nices'' the subprocesses that it starts, graphics-inten-
	       sive subprograms can still overload the machine by causing the  X  server  process
	       itself  (which is not ``niced'') to suck a lot of cycles.  Care should be taken to
	       slow down programs intended for use as screensavers by inserting  strategic  calls
	       to  sleep(3)  or  usleep(3) (or making liberal use of any -delay options which the
	       programs may provide.)

	       Note that the OpenGL-based graphics demos are real pigs	on  machines  that  don't
	       have texture hardware.

	       Also, an active screensaver will cause your X server to be pretty much permanently
	       swapped in; but the same is true of any	program  that  draws  periodically,  like
	       xclock(1) or xload(1).

       Latency and Responsiveness
	       If  the	subprocess is drawing too quickly and the connection to the X server is a
	       slow one (such as an X terminal running over a phone line)  then  the  screensaver
	       might  not turn off right away when the user becomes active again (the ico(1) demo
	       has this problem if being run in full-speed mode).   This  can  be  alleviated  by
	       inserting  strategic  calls to XSync(3) in code intended for use as a screensaver.
	       This prevents too much graphics activity from being buffered up.

       XFree86's Magic Keystrokes
	       The XFree86 X server traps certain magic keystrokes before  client  programs  ever
	       see  them.  Two that are of note are Ctrl+Alt+Backspace, which causes the X server
	       to exit; and Ctrl+Alt+Fn, which switches virtual  consoles.   The  X  server  will
	       respond to these keystrokes even if xscreensaver has the screen locked.	Depending
	       on your setup, you might consider this a problem.

	       Unfortunately, there is no way for xscreensaver itself to override the interpreta-
	       tion  of these keys.  If you want to disable Ctrl+Alt+Backspace globally, you need
	       to set the DontZap flag in your /etc/X11/XF86Config file.  To globally disable  VT
	       switching,  you	can  set the DontVTSwitch flag.  See the XF86Config(5) manual for

	       Some Linux systems come with a VT_LOCKSWITCH ioctl, that one  could  theoretically
	       use  to	prevent  VT-switching while the screen is locked; but unfortunately, this
	       ioctl can only be used by root, which means that xscreensaver can't use it  (since
	       xscreensaver disavows its privileges shortly after startup, for security reasons.)

	       Any suggestions for other solutions to this problem are welcome.

       XView Clients
	       Apparently there are some problems with XView programs getting confused and think-
	       ing that the screensaver window is the real root window even when the  screensaver
	       is  not	active:  ClientMessages  intended  for the window manager are sent to the
	       screensaver window instead.  This could be solved by making  xscreensaver  forward
	       all  unrecognised  ClientMessages  to the real root window, but there may be other
	       problems as well.  If anyone has any insight on the cause of this problem,  please
	       let  me know.  (XView is an X11 toolkit that implements the (quite abominable) Sun
	       OpenLook look-and-feel.)

       MIT Extension and Fading
	       The MIT-SCREEN-SAVER extension is junk.	Don't use it.

	       When using the MIT-SCREEN-SAVER extension in conjunction  with  the  fade  option,
	       you'll  notice  an  unattractive  flicker  just	before	the fade begins.  This is
	       because the server maps a black window  just  before  it  tells	the  xscreensaver
	       process to activate.  The xscreensaver process immediately unmaps that window, but
	       this results in a flicker.  I haven't figured a way  to get around this; it  seems
	       to be a fundamental property of the (mis-) design of this server extension.

	       It sure would be nice if someone would implement the SGI SCREEN_SAVER extension in
	       XFree86; it's dead simple, and works far better than the overengineered and broken
	       MIT-SCREEN-SAVER extension.

       SGI Power Saver
	       If  you're  running  Irix  6.3,	you might find that your monitor is powering down
	       after an hour or two even if you've told it not to.  This is fixed by SGI  patches
	       2447 and 2537.

	       If you're running Irix 6.5, this bug is back.  I don't know a fix.

       MesaGL and Voodoo Cards
	       If you have a 3Dfx/Voodoo card, the default settings for xscreensaver will run the
	       GL-based graphics demos in such a way that they will not take advantage of the  3D
	       acceleration  hardware.	The solution is to change the programs entries for the GL
	       hacks from this:
		      gears -root			 \n\
	       to this:
		      MESA_GLX_FX=fullscreen  gears	 \n\
	       That is, make sure that $MESA_GLX_FX is set to fullscreen, and don't tell the pro-
	       gram  to  draw  on  the root window.  This may seem strange, but the setup used by
	       Mesa and these kinds of cards is strange!

	       For those who don't know, these cards work by sitting between  your  normal  video
	       card  and the monitor, and seizing control of the monitor when it's time to do 3D.
	       But this means that accelerated 3D only happens in full-screen mode (you can't  do
	       it  in  a  window,  and	you  can't see the output of 3D and 2D programs simultan-
	       iously), and that 3D will probably drive your monitor at a  lower  resolution,  as
	       well.  It's bizarre.

	       This probably isn't ever necessary on more modern cards; I'm not sure.

	       If  you find that GL programs only work properly when run as root, and not as nor-
	       mal users, then the problem is that your /dev/3dfx file is  not	configured  prop-
	       erly.  Check the Linux 3Dfx FAQ.

       Keyboard LEDs
	       If  procInterrupts  is on (which is the default on Linux systems) and you're using
	       some program that toggles the state of your keyboard LEDs, xscreensaver won't work
	       right:  turning	those  LEDs on or off causes a keyboard interrupt, which xscreen-
	       saver will interpret as user activity.  So if you're using such a program, set the
	       procInterrupts resource to False.

	       If  you	are  not  making  use  of  one	of  the  server  extensions  (XIDLE,  SGI
	       SCREEN_SAVER, or MIT-SCREEN-SAVER), then it is possible, in rare  situations,  for
	       xscreensaver  to  interfere with event propagation and make another X program mal-
	       function.  For this to occur, that other application would need to not select Key-
	       Press  events  on  its non-leaf windows within the first 30 seconds of their exis-
	       tence, but then select for them later.  In this case, that client  might  fail  to
	       receive	those  events.	This isn't very likely, since programs generally select a
	       constant set of events immediately after creating their	windows  and  then  don't
	       change  them,  but this is the reason that it's a good idea to install and use one
	       of the server extensions instead, to work around this shortcoming in the X  proto-

	       In all these years, I've not heard of even a single case of this happening, but it
	       is theoretically possible, so I'm mentioning it for completeness...

       DISPLAY to get the default host and display number, and to inform the sub-programs of  the
	       screen on which to draw.

       PATH    to find the sub-programs to run.

       HOME    for the directory in which to read the .xscreensaver file.

	       to  get	the name of a resource file that overrides the global resources stored in
	       the RESOURCE_MANAGER property.

       The latest version of xscreensaver, an online version of this manual, and a FAQ can always
       be found at http://www.jwz.org/xscreensaver/

       X(1),  xscreensaver-demo(1),  xscreensaver-command(1),  xscreensaver-gl-helper(1), xdm(1),
       xset(1), Xsecurity(1), xauth(1),  xhost(1).   ant(1),  atlantis(1),  attraction(1),  blit-
       spin(1),  bouboule(1),  braid(1),  bsod(1),  bubble3d(1), bubbles(1), cage(1), compass(1),
       coral(1),  critical(1),	crystal(1),  cynosure(1),  decayscreen(1),  deco(1),   deluxe(1),
       demon(1),  discrete(1), distort(1), drift(1), epicycle(1), fadeplot(1), flag(1), flame(1),
       flow(1), forest(1), galaxy(1),  gears(1),  glplanet(1),	goop(1),  grav(1),  greynetic(1),
       halo(1),  helix(1),  hopalong(1),  hypercube(1),  ifs(1), imsmap(1), interference(1), jig-
       saw(1), julia(1), kaleidescope(1), kumppa(1), lament(1), laser(1), lightning(1),  lisa(1),
       lissie(1), lmorph(1), loop(1), maze(1), moebius(1), moire(1), moire2(1), morph3d(1), moun-
       tain(1), munch(1), noseguy(1), pedal(1), penetrate(1), penrose(1), petri(1),  phosphor(1),
       pipes(1),  pulsar(1),  pyro(1),	qix(1),  rd-bomb(1),  rocks(1),  rorschach(1),	rotor(1),
       rubik(1), sierpinski(1), slidescreen(1), slip(1), sonar(1),  sphere(1),	spiral(1),  spot-
       light(1), sproingies(1), squiral(1), stairs(1), starfish(1), strange(1), superquadrics(1),
       swirl(1),  t3d(1),  triangle(1),  truchet(1),  vines(1),  wander(1),  worm(1),  xflame(1),
       xjack(1),  xlyap(1),  xmatrix(1),  bongo(1), ico(1), xaos(1), xbouncebits(1), xcthugha(1),
       xdaliclock(1), xfishtank(1), xmountains(1),  xsplinefun(1),  xswarm(1),	xtacy(1),  xv(1),
       chbg(1), xwave(1).

       Copyright  (C)  1991,  1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002 by
       Jamie Zawinski.	Permission to use, copy, modify, distribute, and sell this  software  and
       its  documentation  for any purpose is hereby granted without fee, provided that the above
       copyright notice appear in all copies and that both that copyright notice and this permis-
       sion  notice  appear  in  supporting documentation.  No representations are made about the
       suitability of this software for any purpose.  It is provided "as is" without  express  or
       implied warranty.

       Jamie  Zawinski <jwz@jwz.org>.  Written in late 1991; version 1.0 posted to comp.sources.x
       on 17-Aug-1992.

       Please let me know if you find any bugs or make any improvements.

       Thanks to Angela Goodman for the XScreenSaver logo.

       Thanks to the many people who have contributed graphics demos to the package.

       Thanks to David Wojtowicz for implementing lockTimeout.

       Thanks to Martin Kraemer for adding support  for  shadow  passwords  and  locking-disabled

       Thanks to Patrick Moreau for the VMS port.

       Thanks to Mark Bowyer for figuring out how to hook it up to CDE.

       Thanks to Nat Lanza for the Kerberos support.

       Thanks to Bill Nottingham for the initial PAM support.

       And  thanks  to Jon A. Christopher for implementing the Athena dialog support, back in the
       days before Lesstif or Gtk were viable alternatives to Motif.

X Version 11				03-Feb-2003 (4.07)			  XScreenSaver(1)
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