Originally posted by _I_:

i have done it before
play different games on on different pc at the same time

or even 2+ games at the same time on the same pc

due to how steam set it, if you are shairing your libary, and someone is playing say...sim city from your libary, this means that if you launch valhime... the get kicked out of thier game. they can play games from thier own libary still, and you can open every game in your steam libary at once. but only one user may play a game(s) from any given libary at once