...
> > > I.e. two ppl share a desktop. ...
>>
> > Run one VNCServer so two people can view it ...
>
> Excellent.
>
> Now, can anyone see a need for two cursors (or seperate keyboards etc) on
> one physical display?

When using a pen/tablet input device with drawing software and using a mouse 
for window management. Or when useing a CAD/GIS digitizing puck. Both of 
these applications though, you can include the special purpose input device 
in your application software and constrain the pointer for it to your 
application window, thus allowing the application to handle it.

2 keyboards may be necessary for embedded stuff like aeroplane flight 
controls with keypads in many places, but then you're probably not using *NIX 
for that anyways. Might also be handy for Non-linear sound/video editing. 

> Btw, what would the overhead be on having the normal display being a VNC
> client, with a VNC server on the same machine? 

For most apps it would probably be OK, but anything with OpenGL, you just 
wouldn't want to do it. You also wouldn't want to do it on a slightly out of 
date computer.

> ...   Would I be correct in believing there
> is no way of taking my current, non-VNC X session and allowing someone to
> connect to using VNC?

You would be correct, unless someone has written an X server with a VNC 
Server built in.
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