You're probably familiar with the three little buttons in the bottom-left corner of
PowerPoint that let you switch views:
[Normal View] [Slide Sorter View] [Slide Show]
Did you know you could press Ctrl or Shift while pressing them to invoke all
sorts of crazy commands?
Here's a table summarizing what you can do:
There are two notable ones out of those. They're notable primarily because I
don't think there's a way to invoke them except through these shortcuts, though
someone correct me if I'm wrong.
The coolest one is Ctrl + Slide Show. I often find myself playing the full
screen Slide Show just to preview an animation. With this, I can display a little
Slide Show window
simultaneously edit slides in the main window.
The little window is a fully working instance of the Slide Show. Here
I've inked in it, just like I can in the real Slide Show: