How does Samsung S-View Flip Cover work? How does the S-View Flip Cover work? I know some apps that use the proximity sensor to check this and turn on and turn off the screen.

S-View Flip Cover does not require any softwares, so how does it communicate with the device?
It's simple. There are hidden magnets in the front part of the flip cover. These magnets tell the device that S-View Flip Cover is attached.

The glass window that is on the cover is conductive, through which you can operate only that much part of the screen leaving the rest of the screen non operable to avoid accidental touch.

The idea behind is just like the Apple smart cover. What makes the S-View Flip Cover different is the conductive window functionality to accept or reject calls etc.