Some times I run into trouble, where a game in X opens in full screen and I can not kill it.
In MS Windows I would first try ALT-TAB to get out from that program, and if that did not work I kill the program with ALT-F4.
In linux & X this does not help at all.
I found the ctrl-alt-f2 where I can issue a "shutdown -r now" but that is a bit over kill I think?
But is it possible to get up a "task manager" like think from where one could kill a non working full screen program? Or some other way to get out from the situation, other than rebooting the machine?