[WindowsCentral.com]

Deck the halls with boughs of holly! And games. Lots of games.
One of the most popular features of the Xbox One platform isn't really advertised, but for those in the know, it can be supremely useful for households with multiple consoles, and particularly if you're picking up additional Xboxes this holiday season for loved ones. 'Tis the season to share and gift, after all.

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As a by-product of the Xbox One policy of allowing you to use your games anywhere by signing in to your Microsoft Account, you can share your entire Xbox One library with a friend or family member.
Your Xbox One account can be signed into two consoles at any one time, locally, and over the internet. You can be signed into two separate Xbox One consoles permanently as a result, taking advantage of the ability to use your digital Xbox licenses both locally and via a roaming profile. Using this method, you can share your game library so friends and family can play your games without purchasing additional copies — it even works for multiplayer!

Full story from the WindowsCentral blog...