CyberKnight said:
From what I've heard (I haven't used it myself), Steam does some things right. But -- well, since I'm not sure, I'll ask some questions:
Do you still have to sign in to the service with your Steam account to play the game? What happens if Steam (or just your connection to the Steam service) goes down?
If you bought two games on Steam, is it even possible for you to play game A on your PC, and for your housemate (spouse/significant other/roommate/sibling/friend/etc.) to borrow game B and play it on their PC (or even your spare PC)?
Well, to answer your first question, from personal experience if your connection craps out or Steam is down, you can still play your games, you just can't go online with them. Even if you don't have it in Offline mode, you can still play if your not connected. But you do need to be signed in to play any game you bought off Steam. But like I said, even if your connection with it dies you can still play the games, just not online.
And as for your second question, no, its not possible, at least its not possible for you both to play at the same time. If you play game A for a bit, then stop, you can sign in to steam on the other computer, download game B onto there, and let your friend play, but thats pretty impracticle and opens up a whole range of problems, like if your playing game A and your friend is trying to playing game B at the same time as you...
You can gift games to friends, where you buy a game and send it to them, but you can't play it on your PC, and they also need Steam for that.