ten esto lo saque del manual (en ingles)
si quieres encontrarlo busca en "usando game maker" y luego en "eventos"
Citar
In some situation it is important to understand the order in which Game Maker processes the events. This is as follows:
Begin step events
Alarm events
Keyboard, Key press, and Key release events
Mouse events
Normal step events
(now all instances are set to their new positions)
Collision events
End step events
Draw events
The create, destroy, and other events are performed when the corresponding things happen.
si quieres encontrarlo busca en "usando game maker" y luego en "eventos"