I have just seen the Multiplicity software from Stardock and it looks very promising, although the price is a tad high and it won't support my mac. I also know about Synergy but the downside to that is it can't copy and past files and folders between the pc's. Now I also have heard of KVM switches but not sure exactly how they work or if they will do what i want. Can i use one of these switches to link my 2 pcs and mac and then control them from a primary screen but then be able to go onto the other pc/mac monitors much like the Multiplicity software does? Is there anything else out there that does what i am after??