VNC can be used to access an X desktop using another machine, it doesn't handle accelerated 3d graphics. Another way is to use X over the network, both solutions have some advantages.
There are many VNC servers, I don't know which ones to recommend. (I use also x11vnc, it has a different purpose: it shows a locally used desktop.) (I used remote X to access a higher resolution screen of a machine with a modern GPU instead of the SiliconMotion graphics card of my laptop that has bad VGA output quality and slow drivers.)
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