Valve have announced a new Steam Family Sharing Service, which enables your friends and family to share their libraries of games. The new Family Sharing service will become available next week and goes into beta on steam, if you wish to sign-up.
Steam Family Sharing allows close friends and family members to play one another’s games while earning their own Steam achievements and saving their own game progress to the Steam cloud. It’s all enabled by authorizing a shared computer. A Steam account may authorize Family Sharing on up to 10 devices at a given time.
See a family member’s installed game that you want to play? Send them a request to authorize the computer. Once authorized, the lender’s library of Steam games become available for others on the machine to access, download and play.
Steam Family Sharing will soon be available in beta for a limited number of Steam users. To express your interest in beta participation, join the Family Sharing group.