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

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A soft reboot or warm reboot is restarting a computer without removing power. It usually, though not always, refers to an orderly shut-down then reboot.

The Control-Alt-Delete key combination on the original IBM PC was designed to allow a soft reboot for a quicker and more convenient restart than powering the computer completely down then back up.

See also