Is it possible to log your Steam account into two computers at once?

My gaming computer is currently downloading Napoleon: Total War and Supreme Commander 2 which I purchased on Steam, and which will take some time to complete. While this download is going on, I would like to play some of my other multiplayer games on my laptop, but I would rather not interrupt the download to do so.

Is it possible to have both computers logged in at once? I know if I was playing a single player game, I could set Steam into offline mode, then resume the download on the other computer, but this won't work for multi player games.

As several people have mentioned, it is now possible to be logged in on multiple computers at once. Only one computer can be playing a game at a time though. If you start a game while another computer is already in one, you will be notified and told that it will close the other game if you start.

As of the recent Steam Streaming update, yes, it is now possible to log in to one account on multiple computers at once. You can just log in as normal; it no longer logs you out on other computers.

I'm not sure if this has been confirmed to work on multiple networks.

As already said is not possible to be connected to Steam with the same account in more than 1 computer at time.

But maybe this QA can solve your problem: How to continue downloading a game in Steam while playing?