Want a quick way to kill a frozen process? If it has a window, you can use the KDE shortcut of ctrl-alt-esc. This turns the mouse cursor into a skull and crossbones (argh!) and the controlling application of the next window you click on will be sent a 'kill -9'. It's a very abrupt but final death. Another related KDE shortcut is "ctrl-esc", which brings up Ksysguard, its Task Manager.
See this page for some more info:
Dealing with Runaway Processes - Yet Another Linux Blog
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