On Linux 0.01 (10/30/93 1:00:00 AM) I see the following:

        jne cur2		/* check for ctrl-alt-del */

During years I've been working on shared KVM (keyboard, video, mouse) devices, where windows sysadmins did press ctrl+alt+delete as first step, to wake up the monitor from sleep.

If you had bad luck and the KVM was in the wrong port... boom!

I did learn to disable this feature the hard way.

"the new device called the phone" (Ballmer's, but still precious)