VNC VIEWER

Installation

VNC Viewer Free Edition for Windows is supplied as a component of the VNC Free Edition installation program. If the viewer has been installed in this way then it will be accessible via the Start Menu group created during the installation process (usually RealVNC/VNC Viewer 4).
The viewer executable may also be downloaded, either directly or Zipped. VNC Viewer for Windows is designed to run stand-alone, without requiring any other packages to be installed first.

Connecting to a VNC Server

If installed by the WinVNC setup package then VNC Viewer is accessible from the Start Menu.

If downloaded directly, the VNC Viewer can be run either by double-clicking on the program icon, or from the command-line.
The VNC Viewer will present the Connection Details dialog, allowing the IP address or name of the target VNC Server to be specified.



If the VNC server's Display Number is non-zero then the display number can be specified by adding a colon to the server's IP address or name, followed by the display number:

If the VNC server is using a non-standard port number to accept connections then this is specified by adding two colons to the server's address or name, followed by the port number:

Encryption is not currently supported by VNC Free Edition.
Once you have selected the VNC server to connect to, you can simply click OK or press return to attempt to connect to it. If your connection attempt succeeds then the server's details will be added to the Connection Details drop-down menu, to save you typing next time.
Alternatively, you can select the Options... button, to override the default connection configuration, before you connect. See the Configuring VNC Viewer documentation for more details.

Connecting using .vnc files

VNC Viewer Free Edition supports loading and saving of .vnc files, containing a set of connection options. VNC Viewer 4 can load .vnc files saved by itself, or by VNC Viewer 3.
To use a connection options file from the command-line, simply run VNC Viewer with the -config command-line option, followed by the .vnc filename.


If you have installed VNC Viewer using the WinVNC setup package then .vnc files will have been automatically registered, so that you can simply double-click on one to have VNC Viewer open it.
If you have not installed VNC Viewer using the WinVNC setup package then you can instead drag .vnc files and drop them on the VNC Viewer executable icon in order to launch them.
Alternatively, if you have had VNC Viewer 3 installed and have used .vnc files with it then it is likely that VNC Viewer 3 is already registered with Windows as the application responsible for .vnc files. VNC Viewer 4 supports the old /config form of the -config command-line option, so you should find that you can simply replace your old VNC Viewer with the new one and have .vnc files continue to work.

User Authentication

VNC Viewer Free Edition can be used to connect to servers configured for No Authentication or VNC Password Authentication. If VNC Password Authentication is configured then you will be prompted to enter the password. VNC Free Edition does not currently support usernames.

Configuring VNC Viewer

VNC Viewer provides a number of options allowing its behaviour to be tailored to your needs. These are configured in one of three ways listed below.

Changing the Default Options

VNC Viewer allows a set of options to be saved per-user, which will be used as the defaults for all connections that user makes to VNC Servers. These Default Options can be overridden from the Connection Details dialog before making a connection, or during a connection via the F8 Menu, or by specifying the options to override on the VNC Viewer command-line.
While the VNC Viewer is running in listening mode, it will place an icon in the system tray. Right-clicking on this icon will cause a menu to be displayed, through which the Default Options may be accessed. The Default Options are saved on a per-user basis, and are used for all subsequent VNC connections.

Changing the Options for a New/Current Connection

The Options dialog can be accessed from the Connection Details dialog when making a new VNC connection, or from the F8 Menu of an active connection. In either case, the dialog can be used to override any settings configured through the Default Options dialog.

Specifying Command-Line Options

VNC Viewer allows any option to be specified on the command-line when it is launched. Options specified on the command-line override those specified in the Default Options dialog. However, options configured on the command-line can be changed once a connection has been made using the Connection Options dialog.

The Options

The Options dialog consists of a number of pages of options, grouped according to their function. The following documentation describes each option and the equivalent command-line parameters.

Color / Encoding

Auto select
AutoSelect=true/false

The Auto select check-box controls whether or not VNC Viewer should attempt to automatically gauge the speed of the network connection to the VNC Server and adjust its behaviour accordingly. If selected, the viewer will take control of the graphical compression scheme used, and will only request full color updates if the network appears fast enough to support them. If not selected, then the user must select suitable encoding and format options manually.

ZRLE
PreferredEncoding=ZRLE
Hextile
PreferredEncoding=Hextile
Raw
PreferredEncoding=Raw

The ZRLE, Hextile and Raw radio buttons allow the preferred graphical encoding used by VNC Viewer to be controlled by the user. The available encodings are arranged in order of increasing bandwidth requirements and decreasing processing requirements, so that ZRLE is most effective on slow networks such as dial-ups, while Raw is often most effective on fast LANs. The preferred encoding is determined automatically by VNC Viewer if the Auto select checkbox is ticked.

Colour level

The Colour level box controls whether VNC Viewer should request as many colors as it and the server can handle, or one of a predefined set of lower-color, less bandwidth-intensive levels.

Full (all available colors)
FullColour=true/false

If Full Colour mode is selected then VNC Viewer will attempt to render colors as accurately as possible. Otherwise, a reduced number of colors will be used, to limit the required network bandwidth. The reduced color mode to use is determined by the LowColourLevel setting.

Medium (256 colors)
LowColourLevel=2

Low (64 colors)
LowColourLevel=1

Very Low (8 colors)
LowColourLevel=0

If Full Colour mode is not active then VNC Viewer will instead request one of a set of preset lower color modes. These modes range from Medium color, which requests 8bpp palettized pixel data from the server, to Very Low color, which requests pixel data in 3bpp true-color format, causing the entire desktop to be rendered in lurid primary colors.
Note that if the Auto select check-box is ticked then the automatic pixel format selection routines may override the user's selection and cause the connection to revert to Full Colour mode. However, it will not automatically select between the low color options.

Inputs

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