Origin of alt-ctrl-delete

I came across this cool interview with the guy who invented alt-ctrl-delete. Apparently it was originally just meant to be an easter egg and shortcut for the developers at the time, but somehow between the most famous combination of keystrokes ever!

I think the funniest part of the interview is at the end where the developer says,

"It was a 5 min job, I didn't realise I was going to create a cultural icon when I did it. But I have to share the credit. I may have invented it, but Bill made it famous!"