Channels in Carousel can subscribe to one or many 'Full Screen Alert' zones. This allows all the content on a channel to be overridden with high importance messages. What's more, is that these subscriptions can be prioritized. For example, a display in a building might have 3 subscriptions. One for the floor, one for the building, and one for the entire campus. With these subscriptions, external triggers or emergency personnel can quickly dispatch messages to the correct places.