title: Shift running X window (display environment) on SSH X11 forwarding
body: <p>I want to see remotely some running GUI application without kill the current process, I have tried vnc and xrdp, xrdp opens a new blank session, so it is not for me, vnc is good, but not exactly what I need, it uses the screen and devices presents, someone could mess with me moving the mouse or typing on the keyboard.</p>
  
  <p>Therefore I figured out the only way I could do what I need is managing to shift a running X window from one display to another, thus even on a SSH -X (X11 forwarding) I would be able to see it.</p>
  
  <p>I am on this quest for a long time and I didn't found out a conclusive solution, that is the reason I am appealing to you. Could you help me to solve this trouble?</p>
  
  <p>Thanks,</p>