Board Thread:Off Topic/@comment-7079580-20130402173859/@comment-108.249.42.209-20140207161509

Yes, you can, but you have to have Steam installed on both machines and the same log in. You cannot be logged into both machines at the same time. If your intent is to have someone else play the game, I don't know the "legalease" of it, but it would require you to log out on your machine and you will be unable to play it (or any other Steam games) while they are logged into your account.