[F8] Saving A User Customised SWF

I wonder if someone could give me a bit of advice on this. I'm making a little Team Formation application where users can drag objects onto a stage and the SWF will write the X and Y co-ords of each 'player' to an XML file with the teams id as its file name, on loading the page with the SWF the flash file will retrieve the XML file with the location depending on the ID passed via the URL and write the objects to the stage accordingly.

Are their any tutorials out there that explain how to achieve this in a bit more detail?