event return values question

[arbuckle911]

When handling events inside the actual code, what are the return values for?
true if event was handled, false if not? What happens if the event wasn't handled, where will it go next?
(Honestly as far as I can tell true or false has no effect)

[Pompei2]

IIRC, the events "bubble up" from the first element to the last (if it is a mouse click for example, it first goes to the first item at moise position, then to the next and so one) returning true says "stop to bubble up" and false means continue. but i'm not sure 100% if it was like that !