Remotely controlling a Windows or Mac PC is fairly straight-forward. They only have one display, so VNC and other remote control programs automatically connect you with that single display.
Linux, with Xwindows, is a bit more sophisticated as it supports multiple displays. The normal vncserver provides remote users virtual displays...as opposed to allowing you to control the 'real' display you may have left running on your remote PC.
Here's a scenario:
At the office, you left your work PC running and you'd like to remotely control it from your home PC to get some work done after-hours. The regular vncserver would give you a whole new display, but you really just want to take control of your regular, running, desktop.
x11vnc
x11vnc is the right tool for the job and it has lots of nice features too.
To install it on Ubuntu, use apt-get:
apt-get install x11vnc
To run it in a way to give you remote control of your primary, running desktop at the office, do this while logged into your office (remote) PC as yourself:
x11vnc -display :0
Here is a link to the main web page for x11vnc:
http://www.karlrunge.com/x11vnc/
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