Minimizing Windows to See a Desktop.

A sign that I am very tired: I didn't remember if my hotel room has a phone on the desk with my computer and I wanted to check if I can reach over and use that when the expected call comes, so in order to check to see what's behind my field of view (my laptop screen), I tried minimizing my browser window.

Augmented reality for the win? I did see one of my desktops as a result...