I can't help but feel in the majority of cases fleeting access should not be a problem for a modern operating system.

Lets say you are working in an office and get up to go the loo. You lock your work station. You are expecting that your locked computer will mean that a visitor cannot gain access to it in the few minutes you are away.

They could steal the computer, they could destroy it but slipping something into the port of a locked computer shouldn't give them this sort of access.

I feel that we can do better.