unix/vncviewer/vncviewer.man

.TH vncviewer 1 "05 May 2004" "TightVNC" "Virtual Network Computing"
.SH NAME
vncviewer \- VNC viewer for X
.SH SYNOPSIS
.B vncviewer
.RI [ options ] 
.RI [ host ][: display# ]
.br
.B vncviewer
.RI [ options ] 
.B \-listen
.RI [ port ]
.SH DESCRIPTION
.B 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.:

.RS
vncviewer snoopy:2
.RE

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 example ":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.

.SH AUTOMATIC PROTOCOL SELECTION

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 bandwidth is insufficient. However, this only
occurs when communicating with servers supporting protocol 3.8 or
newer, since many old servers does not support color mode changes
safely.

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

.SH POPUP MENU
The viewer has a popup menu containing entries which perform various actions.
It is usually brought up by pressing F8, but this can be configured with the
MenuKey parameter.  Actions which the popup menu can perform include:
.RS 2
.IP * 2
switching in and out of full-screen mode
.IP *
quitting the viewer
.IP *
generating key events, e.g. sending ctrl-alt-del
.IP *
accessing the options dialog and various other dialogs
.RE
.PP
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.

.SH FULL SCREEN MODE
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.

.SH OPTIONS (PARAMETERS)
You can get a list of parameters by giving \fB\-h\fP as a command-line option
to vncviewer.  Parameters can be turned on with -\fIparam\fP or off with
-\fIparam\fP=0.  Parameters which take a value can be specified as
-\fIparam\fP \fIvalue\fP.  Other valid forms are \fIparam\fP\fB=\fP\fIvalue\fP
-\fIparam\fP=\fIvalue\fP --\fIparam\fP=\fIvalue\fP.  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.

.TP
.B \-display \fIXdisplay\fP
Specifies the X display on which the VNC viewer window should appear.

.TP
.B \-geometry \fIgeometry\fP
Standard X position and sizing specification.

.TP
.B \-listen \fI[port]\fP
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
.B vncconfig.

.TP
.B \-passwd \fIpassword-file\fP
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
"~/.vnc/passwd".

.TP
.B \-Shared
When you make a connection to a VNC server, all other existing connections are
normally closed.  This option requests that they be left open, allowing you to
share the desktop with someone already using it.

.TP
.B \-ViewOnly
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
.B \-Shared.

.TP
.B \-FullScreen
Start in full-screen mode.

.TP
.B \-AutoSelect
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 \fB-AutoSelect=0\fP.

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

.TP
.B \-LowColorLevel, \-LowColourLevel \fIlevel\fP
Selects the reduced color level to use on slow links.  \fIlevel\fP can range
from 0 to 2, 0 meaning 8 colors, 1 meaning 64 colors (the default), 2 meaning
256 colors.

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

.TP
.B -UseLocalCursor
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.

.TP
.B \-WMDecorationWidth \fIw\fP, \-WMDecorationHeight \fIh\fP
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 24.

.TP
.B \-log \fIlogname\fP:\fIdest\fP:\fIlevel\fP
Configures the debug log settings.  \fIdest\fP can currently be \fBstderr\fP or
\fBstdout\fP, and \fIlevel\fP is between 0 and 100, 100 meaning most verbose
output.  \fIlogname\fP is usually \fB*\fP meaning all, but you can target a
specific source file if you know the name of its "LogWriter".  Default is
\fB*:stderr:30\fP.

.TP
.B \-MenuKey \fIkeysym-name\fP
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").  Default is F8.

.TP
\fB\-via\fR \fIgateway\fR
Automatically create encrypted TCP tunnel to the \fIgateway\fR machine
before connection, connect to the \fIhost\fR through that tunnel
(TightVNC\-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 \fB\-via\fR option, the host
machine name should be specified as known to the gateway machine, e.g. 
"localhost" denotes the \fIgateway\fR, not the machine where vncviewer
was launched. The environment variable \fIVNC_VIA_CMD\fR can override
the default tunnel command of
\fB/usr/bin/ssh\ -f\ -L\ "$L":"$H":"$R"\ "$G"\ sleep\ 20\fR.  The tunnel
command is executed with the environment variables \fIL\fR, \fIH\fR,
\fIR\fR, and \fIG\fR taken the values of the local port number, the remote
host, the port number on the remote host, and the gateway machine
respectively.

.SH SEE ALSO
.BR Xvnc (1),
.BR vncpasswd (1),
.BR vncconfig (1),
.BR vncserver (1)
.br
http://www.tightvnc.com

.SH AUTHOR
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.