Can anybody recommend a KVM switch for 3 or more computers with USB keyboard/mouse & DVI connectors?
And, has anybody thought about the security level of these KVM switches? I'm thinking the USB interface makes it possible to be 'infected' by malicious software such as a keylogger or somehow transfer data between machines. I'm trying to set up an air-gap; one PC online, the other offline, and I wonder if the USB KVM switch could compromise that.

Other option I spose is to squeeze separate keyboard/mouse/monitor on the desk (might even be cheaper).

I imagine network admins probably use KVM switches a lot and I wonder how much thought is given to the security of these things.

Thanks for any help.