Hi Adam,

I've modified the two applications that you provided to communicate between them vice-versa. Here is code from the two AIR applcitions:

LocalConnAIR1

<?xml version="1.0" encoding="utf-8"?>

<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initConn()">

    <mx:Script>

        <![CDATA[

    import mx.controls.Alert;

        import flash.net.LocalConnection;

        private var connTo:LocalConnection;

        private var connFrom:LocalConnection;

private function initConn():void

{

initConnFromApp1();

initConnToApp2();

}

private function initConnFromApp1():void

{

            connFrom = new LocalConnection();

            Alert.show(connFrom.domain);

            connFrom.allowDomain("app#LocalConnAir2");

            connFrom.client = this;

            try

            {

                connFrom.connect("taskConnectionApp2");

            }

            catch (error:ArgumentError)

            {

                trace("Can't connect.");

            }

}

        private function initConnToApp2():void

        {

            connTo = new LocalConnection();

            connTo.addEventListener(StatusEvent.STATUS, onStatus);

        }

        public function alertFromApp2():void

        {

            Alert.show("Message from App2");

        }

        private function sendMessageToApp2():void

        {

            connTo.send("app#LocalConnAir2:taskConnectionApp1", "alertFromApp1");

        }

        private function onStatus(event:StatusEvent):void

        {

            switch (event.level)

            {

                case "status":

                    Alert.show("LocalConnection.send() succeeded");

                    break;

                case "error":

                    Alert.show("LocalConnection.send() failed");

                    break;

            }

        }

        ]]>

    </mx:Script>

    <mx:Panel horizontalCenter="0" verticalCenter="0">

<mx:Button label="sendMessageToApp2" click="sendMessageToApp2()" />

    </mx:Panel>

</mx:WindowedApplication>

LocalConnAIR2

<?xml version="1.0" encoding="utf-8"?>

<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="onInit()">

    <mx:Script>

    <![CDATA[

        import mx.controls.Alert;

            import flash.net.LocalConnection;

        private var connTo:LocalConnection;

        private var connFrom:LocalConnection;

private function onInit():void

{

initConnFromApp1();

initConnToApp1();

}

            private function initConnFromApp1():void

            {

                connFrom = new LocalConnection();

                Alert.show(connFrom.domain);

                connFrom.allowDomain("app#LocalConnAir1");

                connFrom.client = this;

                try

                {

                    connFrom.connect("taskConnectionApp1");

                }

                catch (error:ArgumentError)

                {

                    trace("Can't connect.");

                }

            }

            private function initConnToApp1():void

            {

            connTo = new LocalConnection();

            connTo.addEventListener(StatusEvent.STATUS, onStatus);

            }

            public function alertFromApp1():void

            {

                Alert.show("Message from App1");

            }

            private function clearTasks(event:MouseEvent):void

            {

            }

            private function sendMessageToApp1():void

        {

            connTo.send("app#LocalConnAir1:taskConnectionApp2", "alertFromApp2");

        }

        private function onStatus(event:StatusEvent):void

        {

            switch (event.level)

            {

                case "status":

                    Alert.show("LocalConnection.send() succeeded");

                    break;

                case "error":

                    Alert.show("LocalConnection.send() failed");

                    break;

            }

        }

       ]]>

   </mx:Script>

    <mx:Panel horizontalCenter="0" verticalCenter="0">

<mx:Button label="sendMessageToApp2" click="sendMessageToApp1()" />

    </mx:Panel>

</mx:WindowedApplication>

Hope this helps,

-Catalin