Messages in the center display
The following illustration shows how messages and notifications may appear in the center display in different situations.
Shown at the top of the center display. Requires immediate action and may have up to three buttons allowing the user to manage the message. Dismiss by swiping right or left. The message will then be saved in Notifications view. 
Shown as a window in the center display and requires immediate action. May have 1-3 buttons for management.
Shown for a few seconds at the top of the center display. It is not possible to do anything with the notification, and it is not saved anywhere.