I once volunteered at a hospital where they made use of a smart card security system - among other things, it would log you out if you removed your card from the reader. This closed all the programs you were running - and logging back in was a slow process.
Needless to say, the smart cards stayed in the users' PCs even when they weren't at their desks.
That's disappointing, Windows has multiple options to handle a smart card's removal, one of which is simply locking the screen, sad they decided to use the "force log off" setting instead.
Needless to say, the smart cards stayed in the users' PCs even when they weren't at their desks.