The one that blew me away, as I am surprised I didn't know it (not that I think I am a know-it-all) and has HIPAA relavence is:

Windows-L to lock the the screen.

I had other convoluted ways to do this but to be able to lock it in one key combo was a eye opener.

Wendell
Pediatrician in Chicago

The patient's expectation is that you have all the answers, sometimes they just don't like the answer you have for them