How to ungrab keyboard from rdesktop with full screen mode

I use rdesktop to connect to some Windows machines, and it works beautifully. I like to allow it to grab keyboard input so I can switch and close windows on my Windows desktop without fear of accidentally doing something to the rest of my Linux desktop.


But to ungrab the keyboard from the rdesktop is like the vmware application.

we use ctrl + Alt+ Enter

and to return it to full screen again we also use ctrl + Alt + Enter