These videos will give you an idea of how Pilot2ATC works. Version 2.0 is the current version. Hoping to get some more videos of it in the not too distant future.
You will notice that Pilot2ATC takes up a significant part of the movie screen. When in actual use, it is resizable, and takes up about 1/4 to 1/3 of a screen at its optimal size. With a 2+ screen sim setup, it fits nicely to the left or right of your SIM. It does not have to be on top of your sim window. It was enlarged for movie making purposes.