TightVNC is a software built under the client/server architecture, and which lets you access the desktop of another computer remotely.
For example, with this program you can access your home PC, or work PC, from any place you find yourself, you only need to be connected to the Internet.
TightVNC is optimized to work with especially slow connections, for example those that work with old modems. The program is able to work practically in real time on most Internet settings.