Available immediately, the service enables users to manage their Steam accounts and install new software while on the move.
Provided the host PC is running an active version of Steam, users can login from a different browser or via the Steam mobile app, and download pre-loads, new releases, or latest purchases.
The purchases will begin to download remotely, theoretically installing by the time users return home.
Remote downloads can be managed and installed by logging into profiles and visiting the Games list on the Steam Community site.
In terms of purchases, when remote sessions are detected, the Steam store will ask whether you'd like to download your new purchases immediately, sending them straight to PCs.
Valve launched its Steam Mobile service earlier this year.
It follows Steam's seventh consecutive year of over 100% growth in 2011.
Growth was attributed to a number of high-selling titles like Elder Scrolls V: Skyrim, which became the fastest-selling game in Steam's history.
The company enjoyed further success earlier this month, following the news that Portal 2 fan-made maps were downloaded more than 1.3 million times in the two days since the launch of the game's 'Perpetual Testing Initiative' update.
Watch a trailer for the Portal 2 'Perpetual Testing Initiative' update below: