>>Well said - the key points in bold.
>
>A clarification: by "logs in" I meant to the network, before starting the App. They start the app and see no login. They either get in or they don't.

This doesn't mesh well with those busy places. I've seen smartcard in action in several places here (a cafe and at checkout in Lidl), specially useful in situations where secondary login is required - the waiter just leans his card on the reader and then uses the same card to touch the screen, seems to be more precise than fingers. Or at a checkout in these chain supermarkets, where floor manager needs to come to approve some action that the regular cashier isn't authorized to do (mostly to return stuff, when they don't have a separate desk for returns). Too bad it doesn't teleport the floor manager to it, she has to walk from the other end.