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author: ilya_cat [+], Submitted: 03.26.03 3a

// Now you can broadcast message with any optional parameters, passed inside of the object
// by Ilya Cat (ilya_cat@mail.ru)

ASBroadcaster.broadcastMessage = function(theEvent,obj) {
	var a = this._listeners;
	var i = a.length;
	while (--i) {
		a[i][theEvent](obj);
	}
};

usage

// Here is a usage of new broadcastMessage 

// create the object with function
a={hello:function(obj){trace(obj.text)}};
// create the broadcasting object
broadcastobj={};
ASBroadcaster.initialize(broadcastobj);
// adding [b]a[/b] as listener
broadcastobj.addListener(a);
// broadcasting message
broadcastobj.broadcastMessage('hello',{text:'Hello, world!'});

msg1 { senocular [+], posted: 03.26.03 5a•03.26.03 5a, top [^] }

broadcastMessage already does that :-\

example (not using this extended broadcastMessage):

obj = new Object()
list = new Object()
list.fun = function(arg){
	trace(arg);
}
ASBroadcaster.initialize(obj)
obj.addListener(list)
obj.broadcastMessage("fun","passed argument");
// traces "passed argument"

msg2 { ilya_cat [+], posted: 03.26.03 5a•-, top [^] }

Yes, I also found it now - it's an undocumented feature of undocumented feature of FlashMX ;-)
In any case, additional parameter is very useful.