Input Director is designed for those folks that have two (or more) Windows systems set up at home. Using Input Director, position the monitors of your systems side-by-side and then you can control them via one keyboard/mouse. To transition between systems is as simple as moving the cursor off the screen on one system and it'll pop up on the next screen (similar to a multi-monitor setup) or via a hotkey combo. You can also share clipboards.
Free download