This barely scratches the surface of callbacks, i haven't even talked about the joys (or otherwise) of the knobChanged one.. but let's stumble and fall before we strap the rocketpack on.
0:00 - a brief framework, using a write node
2:30 - using the onScriptLoad callback
9:00 - Dags! You like dags?
10:00 - playing with onCreate and onUserCreate
18:00 - removing callbacks (but don't)
22:00 - why it's a pain to remove things
(Visit the stinker! / ckr2cyyhmwn :D)