(VNC (virtualnetworkcomputing) is the abbreviation of virtual network computer. VNC is an excellent remote control tool software developed by the famous European Research Laboratory of att. VNC is a free open source software based on UNIX and Linux operating systems. Its remote control capability is powerful, efficient and practical. Its performance can be comparable to that of any remote control software in windows and MAC. In Linux, vnc includes the following four commands: vncserver, vncviewer, vncpasswd, and vncconnect. In most cases, I only need two of these commands: vncserver and vncviewer.)