With an iOS device
Zapping works through the button at the top right (the little square with the arrow down), in the channel list page and it allows to watch the videos in the space provided, on the top of the application, for an unlimited period.
How it works:
- Click on the button at the top right
- Click, then, on a channel
Now you can watch the video for an unlimited period.
In the 4^ gen. Apple TV
In the Apple TV, the Zapping option shows a breadcrum at the top of the TV. So you can browse among channels and your movies without going back to the main menu. As a real TV.