Sugar for cross-module communication without knowledge of each other.

Initiatable.js

(function(){

this.Initiatable = new Class({

	isInitiatable: true,
	initiator: null,

	setInitiator: function(initiator){
		this.initiator = initiator || null;
		
		return this;
	}.protect(),

	getInitiator: function(){
		return this.initiator;
	},

	hasInitiator: function(){
		return !!this.initiator;
	},

	installTo: function(initiator){
		return this.setInitiator(initiator);
	},

	uninstallFrom: function(){
		return this.setInitiator();
	}

});

}).call(this);

Initiator.js

(function(){

this.Initiator = new Class({

	initialize: function(){
		var events = new Events;

		this.$events = {};
		this.listen = events.addEvent.overloadSetter();
		this.ignore = events.removeEvent.overloadGetter();
		this.invoke = events.fireEvent;
	},

	install: function(instance){
		if (instance.isInitiatable) instance.installTo(this);
		return this;
	},

	uninstall: function(instance){
		if (instance.isInitiatable) instance.uninstallFrom(this);
		return this;
	}

});

}).call(this);