As3 Signals

//declare the signal
private var _sigSomthingHappened= new Signal();

// optional Data type for explicit coding incase you 
// want to pass along a specific argument with the signal when its dispatched
// you can use any data type Strings, ints, numbers, value objects etc. 

private var _sigSomthingHappened= new Signal(String);

//DISPATCH
_sigSomthingHappened.dispatch(); 

//DISPATCH WITH ARGUMENT
_sigSomethingHappened.dispatch("playerJumped"); 

//LISTEN TO THE EVENT FROM ANOTHER CLASS
signalLocation.sigSomethingHappened.add(somethingHappened)

or

//if your only want to listen to the event once you can do this
signalLocation.sigSomthingHappened.addOnce(somethingHappened)

//You can listen to a combination of both simultaneously

//EVENT HANDLER

private function somethingHappened(action:String = null):void
{
 trace("the player has:"+action)
}

//REMOVE LISTENERS

signalLocation.sigSomethingHappened.remove(somthingHappened)

//or if you have multiple listeners on a signal and want to remove them all at once
signalLocation.sigSomethingHappened.removeAll();

Delux Signals:
Delux signals allow you to trace the event location and signal which is behaviour we are white used to with native events.

//pass in the location the signal is coming from
private var _sigSomthingHappened= new DeluxSignal(this);

//when dispatching a new GenericEvent must be passed in
_sigSomthingHappened.dispatch(new GenericEvent());

//Listener
signalLocation.sigSomethingHappened.add(somthingHappened);

private function somethingHappened(e:GenericEvent):void
{
 trace(e.target);
 trace(e.signal);
}