Huh? The only hang-up I've heard of is that the Mac uses USB for keyboards, while many existing PC installations use PS2 keyboards. Hence, you would need either a) a new USB keyboard, or b) a PS2-to-USB converter to stick in front of the KVM switch.
Note: You have to also figure out if your video is VGA or DVI. DVI KVM switches are a bit newer, and more expensive.....
You should be able to run a quick google search to see if you'll have major issues or not. Also remember: CompUSA is full of dunderheads - that's why they're there selling computers, rather than doing something useful with 'em.
Thanks, I asked about a PS2-to-USB converter to stick in front of the KVM switch, they told me it would not work. Kinda pissed me off as I could't think of why inot and left empty handed. It's a long drive to compUSA, I wanted to leave with a new system, but didn't want to spend $1000 and I didn't want XP as an OS. Well I can nurse these old P1's and P2's along for a while longer, but it would be nice to have a little more horse power. If OSX is unix then I should be able to telnet to it as a last resort. I also have XWindows installed not the PCs so I should be able to run mac apps that have XWindows UIs withot problems. I might just go buy the damn thing today and be done with it. But I'd like a to know more about OSX first.