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If it's just an app that's locked up use ctrl-alt-escape. Your cursor will change to a skull and crossbones, then just click on the window. If you managed to lock up the entire X server use ctrl-alt-backspace instead.
Start-->run command
xkill
your changed cursor into a bullseye will be self explantory (Left click, kill, right click, cancel). If your entire desktop locks up, CTRL-ALT-Backspace.
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