2015-10-22 10:14 GMT+02:00 Erik Christiansen <dvalin@internode.on.net>:
The closest I've ever been to that sort of thing is getting into X11 on
a *nix server from M$, using Hummingbird Exceed. Once you're into X11,
then I figure that fiddling with $DISPLAY (or similar) ought to go a
long way toward the sharing part of it, since you're only after a
pre-existing display, rather than a new one of your own.

Not exactly.
Of course you can set up an X server on the remote pc (Exceed is just one, MobaXterm [1] is another, but there are others also), and start on the local machine an X client which connect to the remote X server, by playing with dhe $DISPLAY variable, but that's not "sharing": such client will shows its windows just on the remote screen, and as far as I know there's no way to move windows of a running process from an X server to another.

[1] http://mobaxterm.mobatek.net/
--
Mick