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On my keyboard, the key the functions as the Print Screen key when the F-lock is on has "SysRq" below it (presumably to be used when F-lock is off). What is it and what does it do?

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There is a Wikipedia page for the System Request key.

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I recently found out about the Linux "Magic SysReq key". Truly magic! – kwutchak Aug 7 '09 at 2:43
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It is a programmable key which can be made to do a variety of things, depends.

I remember it having some uses on old ibm terminals, and some DOS programs used it for a form of soft resetting.

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