I just wanted to pass on this great Youtube channel. It's called "Dave's Garage" and it run by a developer who worked on MS-DOS and Windows back in the day. He actually invented the task manager on his own time and it was ultimately incorporated into Windows to this day. He wrote quite a few different parts of Windows. He has some interesting stories from back then.
The following is a recent one he posted on CTRL+ALT+DEL with some interesting info on it. I think the most fascinating is that it is hardware secure and if you press it to login, no malware can take over those keys, I didn't know that.
Anyhow, check out his channel, the guy apparently doesn't do the videos for money as I guess he has plenty.