disburden yourself from your multicomputer desk jam-packed with keyboards and mice leading to confusion. use one keyboard and one mouse to controll all your machines in harmonic synergy.
the solution is synergy, a cross platform daemon that allows using one human interface device for all of them together, as easy as moving the mouse cursor from one screen to another.
for all spoiled simplicity freaks who fear the daunting command line, here are two easy to install solutions with nice GUIs:
Mac:
http://software.landryhetu.com/synergy/
Other Binaries:
http://synergy2.sourceforge.net
Windows setup wizard:
http://xhirl.donationcoders.com/main.php?page=synergywizard
enjoy this piece of best-of-all-times freeware!