Send data to module

im calling a module in my flex app, but i need to send it a variable and have no idea how this is done (both sending the variable and then the module retrieving it)…basically, the module generates a tree which gathers data from a PHP-generated XML…so I need the data that is sent to the module to be sent to the PHP file to show the details depending on which page the user is on.

<mx:ModuleLoader url="lists.swf" width="30%" height="100%" />

just a thought, if I were to add “?id=3” to the SWF, would that work and how would I retrieve that value in the module to use?