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vncviewer(1)			    Virtual Network Computing			     vncviewer(1)

       vncviewer - VNC viewer for X

       vncviewer [options] [host][:display#]
       vncviewer [options] [host][::port]
       vncviewer [options] -listen [port]

       vncviewer  is a viewer (client) for Virtual Network Computing.  This manual page documents
       version 4 for the X window system.

       If you run the viewer with no arguments it will prompt you for a VNC server to connect to.
       Alternatively, specify the VNC server as an argument, e.g.:

	      vncviewer snoopy:2

       where 'snoopy' is the name of the machine, and '2' is the display number of the VNC server
       on that machine.  Either the machine name or display number can be omitted.  So for  exam-
       ple  ":1"  means  display number 1 on the same machine, and "snoopy" means "snoopy:0" i.e.
       display 0 on machine "snoopy".

       If the VNC server is successfully contacted, you  will  be  prompted  for  a  password  to
       authenticate you.  If the password is correct, a window will appear showing the desktop of
       the VNC server.

       The viewer tests the speed of the connection to the server and chooses  the  encoding  and
       pixel  format (color level) appropriately.  This makes it much easier to use than previous
       versions where the user had to specify arcane command line arguments.

       The viewer normally starts out assuming the link is slow, using the encoding with the best
       compression.   If  it  turns  out  that the link is fast enough it switches to an encoding
       which compresses less but is faster to generate, thus improving the interactive feel.

       The viewer normally starts in full-color mode, but switches to low-color mode if the band-
       width  is insufficient. However, this only occurs when communicating with servers support-
       ing protocol 3.8 or newer, since many old servers does  not  support  color  mode  changes

       Automatic  selection  can  be  turned off by setting the AutoSelect parameter to false, or
       from the options dialog.

       The viewer has a popup menu containing entries which perform various actions.  It is  usu-
       ally  brought  up  by  pressing F8, but this can be configured with the MenuKey parameter.
       Actions which the popup menu can perform include:

	 * switching in and out of full-screen mode

	 * quitting the viewer

	 * generating key events, e.g. sending ctrl-alt-del

	 * accessing the options dialog and various other dialogs

       By default, key presses in the popup menu get sent to  the  VNC	server	and  dismiss  the
       popup.  So to get an F8 through to the VNC server simply press it twice.

       A  full-screen mode is supported.  This is particularly useful when connecting to a remote
       screen which is the same size as your local one. If the remote screen is bigger,  you  can
       scroll by bumping the mouse against the edge of the screen.

       Unfortunately  this mode doesn't work completely with all window managers, since it breaks
       the X window management conventions.

       You can get a list of parameters by giving -h  as  a  command-line  option  to  vncviewer.
       Parameters  can	be  turned  on with -param or off with -param=0.  Parameters which take a
       value can be specified as -param value.	Other valid forms  are	param=value  -param=value
       --param=value.  Parameter names are case-insensitive.

       Many  of  the parameters can also be set graphically via the options dialog box.  This can
       be accessed from the popup menu or from the "Connection details" dialog box.

       -display Xdisplay
	      Specifies the X display on which the VNC viewer window should appear.

       -geometry geometry
	      Standard X position and sizing specification.

       -listen [port]
	      Causes vncviewer to listen on the given port (default 5500) for reverse connections
	      from  a  VNC  server.  WinVNC supports reverse connections initiated using the 'Add
	      New Client' menu option or  the  '-connect'  command-line  option.   Xvnc  supports
	      reverse connections with a helper program called vncconfig.

       -passwd password-file, -PasswordFile password-file
	      If  you are on a filesystem which gives you access to the password file used by the
	      server, you can specify it here  to  avoid  typing  it  in.   It	will  usually  be

	      Show the dot cursor when the server sends an invisible cursor.

	      Time in milliseconds to rate-limit successive pointer events.

	      Try harder to compress data (default).

       -QualityLevel level
	      JPEG quality level (default is 8).

	      Disable lossy JPEG compression in Tight encoding.

       CompressLevel level
	      Use specified compression level (default is 2).

       CustomCompressLevel level
	      Use custom compression level. Default is CompressLevel is specified.

	      Send  the  primary  selection and cut buffer to the server as well as the clipboard
	      selection (default).

	      Send clipboard changes to the server (default).

	      Accept clipboard changes from the server (default).

	      When you make a connection to a VNC server, all other existing connections are nor-
	      mally  closed.   This option requests that they be left open, allowing you to share
	      the desktop with someone already using it.

	      Specifies that no keyboard or mouse events should be sent to the server.	Useful if
	      you  want  to  view  a desktop without interfering; often needs to be combined with

	      Maximize viewer window.

	      Start in full-screen mode.

	      Enable full screen over all monitors (default).

	      Pass special keys directly to the server in full-screen mode.

	      Dynamically resize the remote desktop size as the size of the local  client  window
	      changes (default).

       -DesktopSize widthxheight
	      Instead  of  keeping  the  existing  remote screen size, the client will attempt to
	      switch to the specified since when connecting. If the server does not  support  the
	      SetDesktopSize message then the screen will retain the original size.

	      Use automatic selection of encoding and pixel format (default is on).  Normally the
	      viewer tests the speed of the connection to the server and chooses the encoding and
	      pixel format appropriately.  Turn it off with -AutoSelect=0.

       -FullColor, -FullColour
	      Tells the VNC server to send full-color pixels in the best format for this display.
	      This is default.

       -LowColorLevel, -LowColourLevel level
	      Selects the reduced color level to use on slow links.  level can range from 0 to 2,
	      0  meaning  8 colors, 1 meaning 64 colors (the default), 2 meaning 256 colors. Note
	      that decision if reduced color level is used is made by  vncviewer.  If  you  would
	      like to force vncviewer to use reduced color level use -AutoSelect=0 parameter.

       -PreferredEncoding encoding
	      This  option  specifies  the preferred encoding to use from one of "Tight", "ZRLE",
	      "hextile" or "raw".

	      Render the mouse cursor locally if the server supports it (default  is  on).   This
	      can make the interactive performance feel much better over slow links.

       -WMDecorationWidth w, -WMDecorationHeight h
	      The total width and height taken up by window manager decorations.  This is used to
	      calculate the maximum size of the VNC viewer window.  Default is	width  6,  height

       -log logname:dest:level
	      Configures  the  debug  log  settings.  dest can currently be stderr or stdout, and
	      level is between 0 and 100, 100 meaning most verbose output.  logname is usually	*
	      meaning  all, but you can target a specific source file if you know the name of its
	      "LogWriter".  Default is *:stderr:30.

       -MenuKey keysym-name
	      This option specifies the key which brings up the popup menu.  The key is specified
	      as  an  X11  keysym name (these can be obtained by removing the XK_ prefix from the
	      entries in "/usr/include/X11/keysymdef.h" - the currently implemented list is:  F1,
	      F2,  F3,	F4, F5, F6, F7, F8, F9, F10, F11, F12, Pause, Print, Scroll_Lock, Escape,
	      Insert, Delete, Home, Page_Up, Page_Down).  Default is F8.

       -via gateway
	      Automatically create encrypted TCP tunnel to the gateway machine before connection,
	      connect  to  the	host  through  that  tunnel (TigerVNC-specific). By default, this
	      option invokes SSH local port forwarding, assuming that SSH client  binary  can  be
	      accessed	as  /usr/bin/ssh.  Note that when using the -via option, the host machine
	      name should be specified as known to the gateway machine, e.g.  "localhost" denotes
	      the gateway, not the machine where vncviewer was launched. The environment variable
	      VNC_VIA_CMD     can     override	   the	   default     tunnel	  command      of
	      /usr/bin/ssh -f -L "$L":"$H":"$R" "$G" sleep 20.	 The  tunnel  command is executed
	      with the environment variables L, H, R, and G taken the values of  the  local  port
	      number,  the  remote  host,  the	port  number  on the remote host, and the gateway
	      machine respectively.

       -ZlibLevel level
	      Zlib compression level.

       -x509crl file
	      X509 CRL file

       -x509ca file
	      X509 CA certificate

       -SecurityTypes types
	      Specify which security scheme to use.

       Xvnc(1), vncpasswd(1), vncconfig(1), vncserver(1)

       Tristan Richardson, RealVNC Ltd.

       VNC was originally developed by the RealVNC team while at Olivetti  Research  Ltd  /  AT&T
       Laboratories Cambridge.	TightVNC additions were implemented by Constantin Kaplinsky. Many
       other people participated in development, testing and support.

TigerVNC				   05 May 2004				     vncviewer(1)
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