The Global operator converts its event into a global event, whose operators affect other events in the flow.
When a Global operator is added to an event, it converts the event into a Global event, whose (particle) operators will affect other (particle) events in the simulation. In other words, all (particle) operators added to an event containing a Global operator will be implicitly inserted into other (particle) events during the simulation. NOTE: Particle operators inside of a Global event will be inserted at the end of the operator list of affected particle events. If multiple Global events affect the same particle event, their particle operators will be inserted in the order of their source Global event’s evaluation order/priority.
Global operators/events only affect other particle events. They will not affect other VDB/Terrain/Inferno/etc events.
Affect all events: all other (particle) events in the flow will be affected by the particle operators in the same Global event as this operator.
Affect specified events: only events with names whose match those specified in the event name list will be affected by the particle operators in the same Global event as this operator.