How can a class send messages to the main movie

I think I have a prety good handle on AS3. I wrote a class, and attached it to a MovieClip, in my main movie, one the user interacts with the class, and the class does it’s thing, I want it to send some infomation back to the main movie (which is also a class). I’m not really sure how to do this. Do I add some sort of custom event listener to class, and then dispatch an event to the main movie from the class? I don’t have alot of experiance with this, I wonder if anyone can help me.