Rumor: Steam Establishing Ability To Share With Friends

The following code was found in the latest Steam client beta:

"Just so you know, your games are currently in use by %borrower%. Playing now will send %borrower% a notice that it's time to quit"

...and

"This shared game is currently unavailable. Please try again later or buy this game for your own library"

Could the real winner of the next-gen console wars be...Valve?