>>>>>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.
>>
>>Switching current user is fast on android and not too lousy even on Windoze if already running and only switched over 2nd or higher occasion. Of course in app is faster, but the added lag to the "non-teleported" time is minimal while security is beefed a lot.
>
>I meant the situations when the app requires two logins within itself - be it the boss, or a witness. Any of those cases when the user is required to prove having a second person watching or doing stuff or co-signing. I've seen a few of those, and no, it doesn't help to leave the app, switch user, let him launch the app, navigate to the document, do his part, then close the app, logout and let the first user log in, launch the app, navigate to the document, and continue.

on the cash register in "semi-kiosk mode" there would be no need to leave the app or (re)launch under new user: after user switch register does a refresh on latest (unwitnessed) data, press button under supervisor account and switch back to normal user. Yes, a few secs more than in app, but nothing earth shattering after first start of supervisor mode.

regards
thomas