Can I move a running application to a different X server?
xmove is a computer program that allows the movement of X Window
System applications between different displays and the persistence of
X applications across X server restarts. It solves a problem in the
design of X, where an X client (an X application) is tied to the X
server (X display) it was started on for its lifetime. Also, if the X
server is shut down, the client application is forced to stop running.