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RedHat 9 (Linux i386) - man page for xscreensaver-demo (redhat section 1)

XScreenSaver(1) 		     General Commands Manual			  XScreenSaver(1)

       xscreensaver-demo - interactively control the background xscreensaver daemon

       xscreensaver-demo [-display host:display.screen] [-prefs] [--crapplet] [--debug]

       The  xscreensaver-demo program is a graphical front-end for setting the parameters used by
       the background xscreensaver(1) daemon.  It is essentially two things: a tool  for  editing
       the  ~/.xscreensaver  file;  and  a  tool  for demoing the various graphics hacks that the
       xscreensaver daemon will launch.

       The main window consists of a menu bar and two tabbed pages.  The first page is for  edit-
       ing  the  list  of  demos,  and	the second is for editing various other parameters of the

       All of these commands are on either the File or Help menus:

       Blank Screen Now
	   Activates the background xscreensaver daemon, which will then run a	demo  at  random.
	   This is the same as running xscreensaver-command(1) with the -activate option.

       Lock Screen Now
	   Just  like  Blank  Screen Now, except the screen will be locked as well (even if it is
	   not configured to lock all the time.)  This is the same as  running	xscreensaver-com-
	   mand(1) with the -lock option.

       Kill Daemon
	   If  the  xscreensaver  daemon is running on this screen, kill it.  This is the same as
	   running xscreensaver-command(1) with the -exit option.

       Restart Daemon
	   If the xscreensaver daemon is running on this screen, kill it.  Then launch it  again.
	   This is the same as doing ``xscreensaver-command -exit'' followed by ``xscreensaver''.

	   Note that it is not the same as doing ``xscreensaver-command -restart''.

	   Exits  the  xscreensaver-demo  program (this program) without affecting the background
	   xscreensaver daemon, if any.

	   Displays the version number of this program, xscreensaver-demo.

	   Opens up a web browser looking at the XScreenSaver web page, where you can find online
	   copies of the xscreensaver(1), xscreensaver-demo(1), and xscreensaver-command(1) manu-

       This page contains a list of the names of the various display modes, a preview  area,  and
       some fields that let you configure screen saver behavior.

	   This option menu controls the behavior of the screen saver.	The options are:

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

	       Only One Screen Saver
		       When blanking the screen, only ever use one particular display  mode  (the
		       one selected in the list.)

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

	       Disable Screen Saver
		       Don't  ever  blank  the	screen, and don't ever allow the monitor to power

       Demo List
	   Double-clicking in the list on the left will let you try out the indicated demo.   The
	   screen  will  go black, and the program will run in full-screen mode, just as it would
	   if the xscreensaver daemon had launched it.	Clicking the mouse again  will	stop  the
	   demo and un-blank the screen, making the dialog box visible again.

	   Single-clicking  in the list will run it in the small preview pane on the right.  (But
	   beware: many of the display modes behave somewhat differently when  running	in  full-
	   screen mode, so the scaled-down view might not give an accurate impression.)

	   When  Mode is set to Random Screen Saver, each name in the list has a checkbox next to
	   it: this controls whether this display mode is enabled.  If it is unchecked, then that
	   mode  will  not be chosen.  (Though you can still run it explicitly by double-clicking
	   on its name.)

       Arrow Buttons
	   Beneath the list are a pair of up and down arrows. Clicking on  the	down  arrow  will
	   select  the next item in the list, and then run it in full-screen mode, just as if you
	   had double-clicked on it.  The up arrow goes the other way.	This is just  a  shortcut
	   for trying out all of the display modes in turn.

       Blank After
	   After the user has been idle this long, the xscreensaver daemon will blank the screen.

       Cycle After
	   jAfter  the screensaver has been running for this long, the currently running graphics
	   demo will be killed, and a new one started.	If this is 0, then the graphics demo will
	   never  be changed: only one demo will run until the screensaver is deactivated by user

       Lock Screen
	   When this is checked, the screen will be locked when it activates.

       Lock Screen After
	   This controls the length of the ``grace period'' between when  the  screensaver  acti-
	   vates,  and	when  the  screen becomes locked.  For example, if this is 5 minutes, and
	   Blank After is 10 minutes, 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  Screen  After
	   minutes  after activation) then a password would be required.  The default is 0, mean-
	   ing that if locking is enabled, then a password will be required as soon as the screen

	   This button, below the small preview window, runs the demo in full-screen mode so that
	   you can try it out.	This is the same thing that happens when you double-click an ele-
	   ment in the list.  Click the mouse to dismiss the full-screen preview.

	   This button will pop up a dialog where you can configure settings specific to the dis-
	   play mode selected in the list.

       This tab lets you change various settings used by the xscreensaver daemon  itself,  rather
       than its sub-programs.

       Grab Desktop Images
	   Some  of  the graphics hacks manipulate images.  If this option is selected, then they
	   are allowed to manipulate the desktop image, that is, a display mode might draw a pic-
	   ture  of  your desktop melting, or being distorted in some way.  The security-paranoid
	   might want to disable this option, because if it is set, it means that the windows  on
	   your  desktop  will	occasionally be visible while your screen is locked.  Others will
	   not be able to do anything, but they may be able to see  whatever  you  left  on  your

       Grab Video Frames
	   If  your  system has a video capture card, selecting this option will allow the image-
	   manipulating modes to capture a frame of video to operate on.

       Choose Random Image
	   If this option is set, then the image-manipulating modes will select  a  random  image
	   file  from  disk, from the directory you specify in the text entry field.  That direc-
	   tory will be recursively searched for files, and it is  assumed  that  all  the  files
	   under that directory are images.

	   If more than one of these options are selected, then one will be chosen at random.  If
	   none of them are selected, then an image of video colorbars will be used instead.

	   (All three of these options work by	invoking  the  xscreensaver-getimage(1)  program,
	   which is what actually does the work.)

       Verbose Diagnostics
	   Whether to print lots of debugging information.

       Display Subprocess Errors
	   If  this  is  set,  then  if  one  of the graphics demos prints something to stdout or
	   stderr, it will show up on the screen immediately (instead of being lost in	a  hidden
	   terminal or file that you can't see.)

	   If  you  change  this  option, it will only take effect the next time the xscreensaver
	   daemon is restarted.  (All other settings take effect immediately.)

       Display Splash Screen at Startup
	   Normally when xscreensaver starts up, it briefly displays a splash dialog showing  the
	   version  number,  a Help button, etc.  If this option is turned off, the splash screen
	   will not be shown at all.

       Power Management Enabled
	   Whether the monitor should be powered down after a period of inactivity.

	   If this option is grayed out, it means your X server does not support the XDPMS exten-
	   sion, and so control over the monitor's power state is not available.

	   If  you're using a laptop, don't be surprised if this 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 only adjust the power-saving delays by
	   changing settings in the BIOS in some hardware-specific way.

       Standby After
	   If Power Management Enabled is selected, the monitor will go  black	after  this  much
	   idle time.  (Graphics demos will stop running, also.)

       Suspend After
	   If  Power  Management  Enabled is selected, the monitor will go into power-saving mode
	   after this much idle time.  This duration should be greater than or equal to Standby.

       Off After
	   If Power Management Enabled is selected, the monitor will fully power down after  this
	   much idle time.  This duration should be greater than or equal to Suspend.

       Install Colormap
	   Whether  to	install  a  private colormap while the screensaver is active, so that the
	   graphics hacks can get as many colors  as  possible.   (This  only  applies	when  the
	   screen's  default  visual  is being used, since non-default visuals get their own col-
	   ormaps automatically.)  This can also be overridden on a per-demo basis.

       Fade To Black When Blanking
	   If selected, then when the screensaver activates, the current contents of  the  screen
	   will fade to black instead of simply winking out.  (Note: this doesn't work with all X
	   servers.)  A fade will also be done when switching  graphics  hacks	(when  the  Cycle
	   After expires.)

       Unfade From Black When Unblanking
	   The	complement  to Fade Colormap: if selected, then when the screensaver deactivates,
	   the original contents of the screen will fade in from black instead of appearing imme-
	   diately.  This is only done if Fade Colormap is also selected.

       Fade Duration
	   When fading or unfading are selected, this controls how long the fade will take.

       There  are  more settings than these available, but these are the most commonly used ones;
       see the manual for xscreensaver(1) for other parameters that can be  set  by  editing  the
       ~/.xscreensaver file, or the X resource database.

       When  you  click  on  the Settings button on the Display Modes tab, a configuration dialog
       will pop up that lets you customize settings of the selected display mode.   Each  display
       mode has its own custom configuration controls on the left side.

       On the right side is a paragraph or two describing the display mode.  Below that is a Doc-
       umentation button that will display the display mode's manual page, if it has  one,  in	a
       new  window (since each of the display modes is actually a separate program, they each may
       have their own manual.)

       The Advanced button reconfigures the dialog box so that you can edit  the  display  mode's
       command	line directly, instead of using the graphical controls.  It also lets you config-
       ure the X visual type that this mode will require.  If you specify one  (other  than  Any)
       then  the  program  will only be run on that kind of visual.  For example, you can specify
       that a particular program should only be run if color is  available,  and  another  should
       only be run in monochrome.  See the discussion of the programs parameter in the Configura-
       tion section of the xscreensaver(1) manual.

       xscreensaver-demo accepts the following command line options.

       -display host:display.screen
	       The X display to use.  The xscreensaver-demo program will open its window on  that
	       display,  and also control the xscreensaver daemon that is managing that same dis-

       -prefs  Start up with the Advanced tab selected by default instead of  the  Display  Modes

	       For  use by the Gnome Control Center code: this causes this program to be embedded
	       inside the Control Center window.

       -debug  Causes lots of diagnostics to be printed on stderr.

       It is important that the xscreensaver and xscreensaver-demo processes be  running  on  the
       same  machine,  or  at  least,  on  two	machines that share a file system.  When xscreen-
       saver-demo writes a new version of the  ~/.xscreensaver	file,  it's  important	that  the
       xscreensaver  see  that	same file.  If the two processes are seeing different ~/.xscreen-
       saver files, things will malfunction.

       DISPLAY to get the default host and display number.

       PATH    to find the sub-programs to run.  However, note that the sub-programs are actually
	       launched  by  the  xscreensaver daemon, not by xscreensaver-demo itself.  So, what
	       matters is what $PATH the xscreensaver program sees.

       HOME    for the directory in which to read and write 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 can always be found at http://www.jwz.org/xscreensaver/

       X(1), xscreensaver(1), xscreensaver-command(1), xscreensaver-getimage(1)

       Copyright  (C)  1992, 1993, 1997, 1998, 1999, 2000, 2001, 2002 by Jamie Zawinski.  Permis-
       sion 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  permission  notice  appear  in
       supporting documentation.  No representations are made about the suitability of this soft-
       ware for any purpose.  It is provided "as is" without express or implied warranty.

       Jamie Zawinski <jwz@jwz.org>, 13-aug-92.

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

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

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