Having to switch between computer to computer [locally] is tiresome. Yes that's right, rotating your head 75 degrees hurts after a while, nevermind the shift in your body.
I have a tri-monitor setup, plus two laptops. Moving my hands each time to keyboard sucks. This is where Synergy comes in. In short, it's software KVM, so to speak. That means no special hardware. Share one keyboard/mouse between multiple clients. Interesting, eh?
Here's a quick tutorial on getting it set up.