TightVNC is a free remote control software package. With TightVNC, you can see the desktop of a remote machine and control it with your local mouse and keyboard, just like you would do it sitting in the front of that computer. TightVNC is:
free, GPL-licensed, with full source code available;
useful in remote administration, remote customer support, education, and for many other purposes;
cross-platform, available for Windows and Unix, compatible with other VNC software.