Use LocalConnections
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<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
import flash.net.LocalConnection;
private var _localConnection:LocalConnection = new LocalConnection( );
private function sendMessage(event:MouseEvent):void {
_localConnection.send("dataChannel", "displayMessage", message.text);
}
</mx:Script>
<mx:VBox id="vbox">
<mx:TextArea id="message" />
<mx:Button click="sendMessage(event)" />
</mx:VBox>
</mx:Application>
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