Wow!
This has to be one of the coolest SW programs I've tried in a long time! All you do is turn it on on both computers, then, just like using multiple monitors, you drag the computer you want to control to the left or right of your screen, each indicated by a box. Then, it requests permission from the to-be-controlled computer. If permission is granted, then whenever you move the mouse to whatever side of the screen you placed the other computer's box, a little rounded box shows up on your screen, just like the volume and eject boxes, to indicate that you are controlling the other computer. The other computer's pointer moves like normal! This is really fun and has huge potential, for example if you are administering multiple Macs. For a beta, this is great!