EVENT
Events are used with triggers.
There are four general classes of events: Character Events, Mud Events, Aura Events, and Custom Events. Character events are those that indicate a character is interacting with its environment -- see CHAR-EVENT. Mud events are events that the mud will send to elements periodically -- see MUD-EVENT. Aura events are for events related specifically to auras. Custom events are user-defined events created by builders and spawned by builder's behaviors.
Custom events may or may not have an actor, depending on the information the builder included in the event when it was spawned. The custom event cannot be used with the "after" option.
Event: Set off whenever: custom <custom event#> a custom event occurs, see CUSTOM-EVENTS