VNC lets you use a computer remotely. Under Unix, it starts what appears to programs to be an Xserver that they can run under, but it doesn't really connect to a screen, keyboard, or mouse. You then use a viewer program to see the state of the VNC session. Unlike X windows, viewers can come and go as they please without disturbing the session. So you can access your VNC session from anywhere without restarting all your programs.

Here's the Official Site. They don't make it obvious anymore, but there is a free version available for download (lacking only a few "enterprise" features that are rarely necessary). If you use Linux, look for a package in your distro called something like vnc4.

Here are instructions for tunneling VNC through SSH, but if you are running a recent viewer, it's easier to use the -via command line option.

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