Flash Remoting is a way Flash uses in order to talk to servers. This communication need to use ColdFusion, or install server side extensions in .Net or Java based servers. AMFPHP is a new proyect that offers the best of Flash Remoting in a free, open source PHP envinronment. This tutorial is a first step to build your own service trough a versy simple example. Also there's a page dedicated to those running Mac OSX