[ubuntu] How can I reliably kill / restart XBMC in a way my mom can use?

view story

http://ubuntuforums.org – I have a laptop running Ubuntu and XBMC for my parents can use. Occasionally, XBMC will freeze and they have no way of restarting XBMC. The desktop is unresponsive. If this was on Windows, my parents would hit `ctrl-alt-del`, kill XBMC, and reopen it. If this was me, I'd drop into shell and run `pkill xbmc`. I need a method my parents can use on Ubuntu. Restarting the laptop every time XBMC freezes is not an option. I tried running `xkill`, but it complained that it can't grab cursor. I rebound Task Monitor to `ctrl-alt-del`, but it doesn't work when the system is locked up. I'm op (Hardware)