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TightVNC is one example of a VNC Server client and Clientserver, a standard means of remote accessavailable from http://www.tightvnc.com.
Running a [http://en.wikipedia.org/wiki/Virtual_Network_Computing VNC] (virtual network computing) server software on Windows allows you to connect to the Windows graphical environment using VNC client software on a remote computer. There are various VNC client and server softwares, such as TightVNC and UltraVNC. There are VNC clients for probably every operating system, so you don't need to be running Windows to connect to and use Windows. VNC uses the [http://en.wikipedia.org/wiki/RFB_protocol RFB protocol], a defined standard method for remote access, so generally speaking any VNC client will connect to any VNC server, however occasionally some VNC implementations have added non-standard features that other clients may not support, examples of this are UltraVNC's remote login and file transfer features.
VNC clients connect into the session currently running on Windows, so the remote user and the person who might be sat at the computer see the same thing; the client doesn't get a separate login prompt, if someone is already logged into the computer then you see that, otherwise you get to login.