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Oftentimes you will have more than a single computer that you want to use. Cluttering up your workspace with two keyboards and two mice is simply not necessary. '''[http://synergy2.sourceforge.net/ Synergy]''' is [[WikiPedia:Gpl|GPL]] (free) software that will allow you to control your Windows, Mac and Linux computers from a single keyboard and mouse. You ''could'' use a KVM switch, but that's expensive and not necessary if your computers are on a shared network. You can even 'copy' and 'paste' from one computer to the other. Sound too good to be true? [http://reviews.cnet.com/Control_two_computers_with_one_keyboard_and_mouse/4660-10165_7-6663696.html Watch the video on CNET]

Another scenario where this is handy is if you have a [[Free_Technology_in_the_Living_Room|media center PC]]. The Media Center PC is either tucked away next to your TV, or even in your basement or a closet - making it difficult to use the keyboard and mouse to control it. While you could get a wireless keyboard and even a gyroscopic mouse to control your Media Center, you could also just use Synergy and your notebook computer as the controlling keyboard / mouse. What this means, if it's not obvious, is that you sit on the couch with your notebook computer, and as you move your mouse off the (right/any) side of the screen, all of a sudden your mouse and keyboard are controlling the media center PC. Move the mouse pointer back off the side of the media center screen and it appears on your notebook again.

For Linux, it's as simple as