Smart Card operated KVM from Raritan
Physical security of a system is one of the most important parts of a layered security plan.
You can invest a lot of money in protecting a system from being attacked through the network
but if you neglect physical security- a perpetrator just needs to walk up to a system (or a device)
that provides access to a system and access it...
According to Engadget, Raritan provides a KVM to be accessed by a smart card owner only:
http://www.engadget.com/2007/08/16/raritan-intros-smart-card-reading-kvm-switch-system/