(written from a Production point of view)
Xbox SmartGlass is a companion "Second Screen" app for the Xbox and Xbox One that runs on iOS, Android, and Windows. Designed by Microsoft, it was first released in late 2012.
To date, only one product has taken advantage of the Xbox SmartGlass system, Star Trek Into Darkness, which had a companion app, Star Trek Into Darkness, that contained several exclusive deleted, expanded, and alternate scenes.
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