TightVNC can access a remote computer from across the room, or across the globe. The remote desktop appears in a local window, and you can use all its functions as if you were sitting in front of it. This is useful if you need to use two computers at once, access your home machine while travelling, or to provide remote technical assistance.
TightVNC is an optimized and well supported implementation of the VNC standard. TightVNC is also cross platform; since there are versions of TightVNC for Windows, Linux, Unix, and Macintosh, you can get to your desktop regardless of the client platform.