timppu: Don't be daft. They don't have to send any SWAT team, simply disabling the account is enough. They can claim they did it for security reasons as it seemed someone else might have broken into the account. At that point, what do you tell them? That you have wittingly shared the account password with other users? Well then, is Valve ok with that at that point?

Anyways, the OP did ask what he is _allowed_ to do, not what he can possibly get away with if he is careful enough. It is a similar question as some new GOG users have earlier asked "So because GOG games don't have DRM to stop sharing it with friends, does it mean I am allowed to share all my GOG games with all my friends?".

It would be odd if someone had replied to them "Sure, why not, I mean, GOG can't really tell if you have shared your games or not.". Or at least I thought so, but apparently I was wrong. :)

OldFatGuy: Surely though there is a difference between friends and live in relatives isn't there?? Are you suggesting a man couldn't even allow his spouse to play his games as long as he didn't play them at the same time?

timppu: I personally feel you should be allowed to do that. And maybe even Valve feels so, even if their EULA says something else.

But the thing is, if they detect the same account being accessed on different places at the same time, how can they tell why it is happening? Maybe they don't react at all, maybe they call you and ask about it, maybe they disable the account temporarily waiting for you to contact them to clarify it? Who knows.

Personally, if I was in your situation, I'd try to make sure the Steam clients on the "offline mode PCs" can't connect to internet, even if they tried. Either disable internet on them, or block Steam client in the firewall, or whatever. But your mileage may vary.