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Valve has officially announced that Steam Family Sharing, where you can share entirely game libraries with friends and family, is now out of Beta and part of the regular Steam offering. The service is available to any Steam users who have the application installed and allow for families and groups of friends to club together to buy games and share them. Previously, the only way to do this was to set up a separate Steam account and share the username and login details with whoever wanted to play the games on the account.