How does it wok exactly and what do you need to do or download ??
If you have disc version of a game that’s on the list - put it in your X1 drive, let it install / update and you’re good to go. If you have a digital license for any of the games on your list it’s even easier, it should show up as installable under My Games and Apps. Once installed you just play it like any other game, only you can use stuff like screenshots, Game DVR, parties and broadcast to Twitch. More details here on Xbox.com 