Some recent changes:
Windows packages updated to 3.3.3r9 -
No virus in WinVNC! - 8/3/01
A list of all known encoding numbers in use
Unix packages updated to 3.3.3r2 -
Note: The FAQ and some other bits of the documentation
constantly being updated. We only record major changes
What is VNC? - A practical introduction
VNC stands for Virtual Network Computing. It is, in essence, a remote display
system which allows you to view a computing 'desktop' environment not only
on the machine where it is running, but from anywhere on the Internet and
from a wide variety of machine architectures.
Many of us, for example, use a VNC viewer running on a PC on our desks
to display our Unix environments which are running on a large server in
the machine room downstairs.
The VNC system allows you to access the same desktop
from a wide variety of platforms.
What makes it different from other systems?
For this simple mode of operation, you could achieve a similar effect by
installing an X server on your PC. The important factors which distinguish
VNC from other remote display systems such as X are as follows:
No state is stored at the viewer. This means you can leave your desk, go
to another machine, whether next door or several hundred miles away, reconnect
to your desktop from there and finish the sentence you were typing. Even
the cursor will be in the same place. With a PC X server, if
your PC crashes or is restarted, all the remote applications will die.
With VNC they go on running.
It is small and simple. The Win32 viewer, for example, is about 150K in
size and can be run directly from a floppy. There is no installation needed.
It is truly platform-independent. A desktop running on a Linux machine
may be displayed on a PC. Or a Solaris machine. Or any number of other
architectures. The simplicity of the protocol makes it easy to port to
new platforms. We have a Java viewer, which will run in any Java-capable
browser. We have a Windows NT server, allowing you to view the desktop
of a remote NT machine on any of these platforms using exactly the same
viewer. (The NT server is not multi-user - see the documentation). And other people have ported VNC to a wide variety of other platforms. Click the 'Contributed' button on the left for details.
It is sharable. One desktop can be displayed and used by several viewers
at once, allowing CSCW-style applications.
It is free! You can download it, use it, and redistribute it under the
terms of the GNU Public License. Both binaries and
source code are available from the download page,
along with a complete copy of this documentation.
Where does the name come from?
The name originates from our development of very-thin-client ATM network
computers. The Videotile
was essentially an LCD display with a pen input and a fast ATM connection.
Because the VNC viewer is a software-only version of this 'ATM Network
Computer', and so provides 'workstations' which can be created or deleted
at will, we named the system Virtual Network Computing.
Can I see what VNC looks like?
We have some screenshots of very simple
VNC desktops running and being displayed on a variety of platforms.
Follow the links on the left to find out more...