What actions trigger active and notactive events?

The events described here. I’m playing around with them, it seems the time() and play() functions trigger the active() event, but I can’t seem to be able to trigger the notactive event. I thought that by playing other timelines the current active would become not active, or if I used stop()it would become not active, but nothing I do triggers that event. When does an element becomes the active element in a controller, and when does it cease to be? While I’m at it, what’s this enqueue function about? I’d like a small example of usage. Thanks.

I’m curious as well. Have you learned anything about it? The docs are a bit lacking on the topic.