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This command is used to find out which door is associated with a given event. It’s an integer input whose parameter i is an event number, and the auxiliary boolean n represents the next field status of the respective event (read-only). See Integer input.
It gives instant visual feedback locking the mouse selection on the door associated with the selected event. If the selected event isn’t associated with any door, the mouse selection points nowhere. BACKSPACE keeps the mouse selection where it is, while / restores it to the state it had before this command invocation.