Unsubscribe an event handler(s) from an event. If a specific handler is specified for an event, only that handler will be unsubscribed. Otherwise all handlers will be unsubscribed for that event.
Subscribe an event handler to a particular event name, multiple handlers per event name are allowed.
Once listens to an event one time, then unsubscribes from that event
Unwires this event dispatcher from another
Wires this event dispatcher to also receive events from another
Clears any existing handlers or wired event dispatchers on this event dispatcher