[LUGSB] Changing Display of Running App

[Aaron Pellman-Isaacs]

I've been trying to figure out how to do this for a while and was wondering 
if anyone knew.
Basically, I want to know how (or if its even possible, though I'm thinking 
it is) to change the X display of a running application. A couple 
possibilities I was thinking for it:

1)running ssh with X forewarding on and wanting to keep an application 
running after shutting down tghe connection (i.e. by shifting it to the 
local X session on the machine its running on).

2)seeing the gui of a specific app using ssh with X forwarding enabled and 
then shifting the gui back to its normal X display before closing the ssh 
connection.

3)With a vnc server, keeping an app open after closing the vnc instance by 
shifting the app off the vnc desktop to a local X session.

4)with more than one X session running locally, shifting apps between them.

etc, anyways, anyone know how to do this? I was thinking it might be hard to 
do because in most cases that I mentioned it involves different login 
sessions, but still, perhaps it's possible.
thanks,
Aaron