Windows: Multiplicity is an application in the vein of previously mentioned Synergy that allows you to control multiple Windows computers with a single keyboard and mouse. It's also quite spendy.We've detailed how to control multiple computers across platforms with a single keyboard and mouse using Synergy, and it's a free, open source option. The catch: For some, the setup process leaves a little to be desired.
Synergy improved its interface in recent releases, but if you've tried Synergy on Windows and just couldn't get it working the way you wanted, Multiplicity is a viable, if expensive, alternative. For $US30 it can control three PCs. For a whopping $US50, it works on up to six computers and can copy files and folders between PCs.
The takeaway: If Synergy isn't working for you after following our guide, you're only using Windows computers, and you don't mind dropping a wad of cash, Multiplicity is a good option. For our part—we'll stick with Synergy.