What you're referring to is accessing the KVM box itself via IP, which the Aten does allow. What Aten *also* does is use CAT5 cable to link the KVM switch to various adapters which plug into the server(s). It's the signalling on those lines that Brian was referring to, not remotely accessing the KVM itself.
Ok! Sometimes we jump to conclusions without reading carefuly. Sorry! Thank you for the explanation.