The Event Trigger - Parallel Process?
I'll explain all of them, if you want.
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Action Key
You stand next to or on the event and press the action key (Enter)
Touch by Hero
The event is triggered the moment the hero stands on it
Collision with Hero
Not too sure - I believe that the event moves towards the hero, or is moving, and if it touches the hero, then the event is triggered
Auto-Start
Starts automatically
Parallel Process
Usually used with loops and conditional branches in the event - the moment a variable is changed, the event takes note of it, and may be triggered if the variable is correct (a switch turning on, for example)