Question On Update Events

[johnwick11]

So I'm trying to figure out how the update events work exactly. When you register for an update event inside of a script, is that event specific to the script it was called in? Or does it work between scripts, so that if you register it in one place, you can catch it from whatever else script? If it is the second, does it kind of also mean that there can only be one event registered at a time for the whole game?