The XScreenSaver reference article from the English Wikipedia on 24-Apr-2004
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XScreenSaver

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XScreenSaver is a screensaver program for Unix-like operating systems running the X Window System. It is maintained by Jamie Zawinski. Open source Unix-like systems such as Linux use it almost universally.

One reason for XScreenSaver's tremendous popularity is the ease of adding extra modules, known as "hacks". The program's home page states "Any X program that can draw on the root window can be used with xscreensaver."

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