It features a double screen - two interconnected stories - and you can swap between them at any time, with the stories merging every so often. In this film, for the French train company, it is a documentary style and a soap style story that are interconnected. But the range of different stories that could work with this interface is much wider. In fact, I think the interface is very slick and inspiring in the opportunities it could present.
Two characters points of view. A 'Timecode' style story. Or even a factual piece.
Watch it here - http://www.cotefenetrecotecouloir-sncf.com/en/#/movie/