The history of the three-finger salute

Bill Gates appears to have not infrequently gotten things right by accident:

Speaking at a fundraising campaign at Harvard University, however, Gates
blamed IBM engineer David Bradley for the so-called “three-fingered
salute”, claiming that he had favoured a single button.

“We could have had a single button, but the guy who did the IBM keyboard
design didn’t want to give us our single button,” he said.

Bradley originally designed Ctrl+Alt+Esc to trigger a reboot, 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 Ctrl+Alt+Del – a
combination that was impossible to press with just one hand on the original
IBM PC keyboard.