Can Flash MX write to XML data on a server, and if so, then how?

Hi,

Anyone got any ideas about how I can allow a user the chance to dynamically alter XML data that resides on a server. I would like to give the chance for my clients to retitle images, within XML data, if possible, and am trying to do this without writing any ASP as a backend to the site

any help or points in the right direction would be greatly appreciated!!

THANKS!