The flip scene is a special scene that allows you to switch back and forth between two different scenes, as opposed to just having a single scene turn on and off. Only scenes 5-10 can be set up as flip scenes, because they swap with scenes 11-16 respectively when triggered.
There are two different triggering modes for a flip scene. They are trigger by INPUT and trigger by RELAY. Whichever mode is being used will be displayed in the top right hand corner of the scene:
