The thing is that he doesn't have JCS, because he downloaded JJ2.

There are five Trigger events.

1. Trigger Crate

That metal box which you can stomp to open doors.

Parameters:

Trigger ID: sets the ID of the trigger that is activated when you stomp the crate.

2. Trigger Zone

Invisible event which activates triggers when touched. Wasn't used in the original game, so don't seek for it.

Parameters:

Switch: Was meant to make a switch option (touch it ones to activate a trigger, touch it again to deactivate it) but it doesn't work.
Onoff: This one sets if a trigger is activated or deactivated.
Trigger ID: sets the ID of the trigger that is activated when you touch the Trigger Zone event.

3. Trigger Rock

This one is used for the falling rocks in the jungle levels. Once you touch this invisible event, the rock with the right ID falls down.

Paramters:

Rock ID: sets the ID of the rock that falls down when you touch the Trigger Rock event.

4. Trigger Scenery

This is the actual event which gets activated by a trigger crate or zone (example: once you break a trigger crate a door opens, the door has the trigger scenery event on it)

Parameters:

Trigger ID: sets the ID of the Trigger Scenery event. If the ID is 1 and the ID of a crate is 1 too, breaking the crate will activate this Trigger.

5. Rotating Rock

The rock from the jungle levels, falls down once activated.

Parameters:

Y-Speed: I'm not sure.
X-Speed: I'm not sure either. I think both set the speed on which the rocks are moving once activated.
Rock ID: sets the ID of the Rotating Rock event. If the ID is 1 and the ID of a Trigger Rock event is 1 too, touch the Trigger Rock event will activate the Rock.

I hope this helps, this is all the info I could get.