OnTrigger
From The Elder Scrolls Construction Set Wiki
Syntax:
begin OnTrigger TriggeringRefID
Example:
begin OnTrigger begin OnTrigger player
This block will be run once when something triggers the scripted object by colliding with it. If you specify a TriggeringRefID, the block will only run when that specific reference triggers the object; otherwise, the block will run when anything triggers the scripted object.

