The latest Steam Beta client now allows PC owners to start their downloads while their away from their computer. By utilizing your browser-enabled phone, you can initiate a download on Steam’s website for your account regardless of your current location.
Once you have the downloaded the Steam Beta Update, you can start using this handy feature. Here are the steps for remote download of Steam content:
Remote Downloads are enabled from any web browser when you leave the Steam application running on your PC or Mac. Of course, we only recommend you do this on your own private, secured computer. When you’re logged into Steam on your home PC or Mac, you can manage your library by visiting your Games list on the web.