(iphone) what does [super touchesBegan/Moved/Ended] do?

Most overloaded methods require [super theMethod] call.

(For example, [super viewDidLoad];, [super viewWillAppear]; and [super dealloc];)

I didn't think twice whether I need [super touchesBegan:withEvent:] call or not, but it seems to play a role somehow.

When do I need it and when don't I need it?

I'm trying to programmatically cancel touch events when I need to, and it seems to be related to the question I asked.