[...]
> I am not sure whether it will be at all possible
>  to run multiple
> orgs on each VT.
> Does the VT design incorporate this kind of a
>  behavior ? This will be like
>   providing multiple virtual display framebuffers.

Don't know how VT will do this, but IIRC, SCO Unix could do it,
years ago.  I think their virtual consoles included a mechanism whereby a
process (the X server, in this case) could register to be informed
(via signals?) when a switch to/from the console was attempted,
and/or a process (that caught the key sequences the would switch in
console mode) could trigger the switch themselves.  The X server would
keep enough state for the frame buffer that it could release it and
reaquire it later.
 
 
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