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This goes back to the early PC days when somebody coded into the first IBM PC BIOS that when you press control, alt and delete at the same time the machine would reboot. This keyboard combination has since found its way into various other operating systems, performing different functions over the past 30 years, but who actually decided on that keyboard combination in the first place?

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closed as not constructive by Kyle, BloodPhilia, random♦ Aug 1 '11 at 20:51

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David Bradley, a designer of the original IBM PC, as per Wikipedia.

Bradley originally designed Control-Alt-Escape to trigger a soft reboot (without warning or confirmation by the user), but he found it was too easy to bump the left side of the keyboard and reboot the computer accidentally. He switched the key combination to Control-Alt-Delete, a combination that was impossible to press with just one hand...

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I feel the Wiki covers this pretty well. It was designed by David Bradley, the original IBM PC designer. To read more click HERE

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