VNC is platform-independent – a VNC viewer on one operating system may connect to a VNC server on the same or any other operating system. There are clients and servers for many GUI-based operating systems and for Java. Multiple clients may connect to a VNC server at the same time.
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For connecting to remote desktop of another computer (via internet or network) and controls. Also connecting to VNCServer through Repeater or directly to VNCServer and a lot of other configuration options. For more details VNCServer