This app has one narrow purpose: It lets you control multiple computers with a single keyboard and mouse. Say you occasionally run your laptop next to your desktop—move your mouse to the edge of your desktop screen, and suddenly the pointer shows up on your laptop screen. It's like magic—especially since it works between platforms (you can move your mouse from your Mac to your PC).
Here's a software I'd like to have linked here so I can find it in that awkward moment a need arises for such a thing. This is one of those life savers that one doesn't care about until one needs them. Use the same keyboard and mouse for multiple computers. Very neat if you use them. Totally useless if not. But, sooner or later, such situations occur.