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Consider the figure below where F denotes an opener or closer floor, E denotes an event and D denotes a door or level door.
Each opener and closer floor is actively associated with one (and only one) event (by its extension) and each event is associated with one (and only one) door or level door. In the other way around, each door may be passively associated with multiple events, and each event with multiple floors.
When the kid presses an opener floor (closer floor resp.), the event associated with it by its event extension is triggered, then the door associated with that event is opened (closed resp.), and the next event may or may not be triggered depending upon the next field status of the triggered event.
This non-terminal command has terminal sub-commands for setting events and navigating through the floor-event-door tree.
The selected event is the event targeted by the sub-command actions. At return (for all sub-commands) BACKSPACE updates the selected event, while / maintains its previous value.