PHP and Post Data

Hi I'm trying to integrate PHP Support into a basic webserver i am creating for personal use (Windows). However i've run into a problem. I've got the _GET vars working, (using the QUERY_STRING Environment Variable), yet i can't figure out how to get the _POST vars set. my webserver has the POST data stored in a variable, i jsut need to know how to tell PHP the post data. On the webserver GET support works perfectly, as does POST support, all i need to do is tell PHP what the data is. Any help would be appreciated. -Shane