Xautolock monitors console activity under the X window system, and fires up a program of your choice if nothing happens during a user configurable period of time. You can use this to automatically start up a screen locker in case you tend to forget to do so manually before having a coffee break. Xautolock will typically be used to lock the screen but it really doesn't care what program you make it start. The only real assumption made by xautolock is that a new countdown starts as soon as the locker exits.
WWW: http://freshmeat.net/projects/xautolock/
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