Kvm Switching Via Hotkeys



I use a USB KVM switch which I am using to bounce between my PC and my 10.3 G3 iBook. It came a with a cool program for hotkey switching, but it's PC only. That is, I can run it on the PC side and use it to switch to the Mac, but then I have no way to get back! (At least, not via hotkeys).

Is there a program I can download somewhere that can do this? Synergy is not quite what I'm looking for... any others?