how to get POST vars without track_vars turned on? - please help

(Please respond to me directly as I am not yet a subscriber to this list.) We have an extensive PHP/MySQL system which has been developed on a local system which has the "track_vars" turned on in the .ini file. This feature has allowed the use of $HTTP_POST_VARS to be used by php scripts which need to handle POST data but cannot assume to know the list of variable names which are POSTed. We have copied the system to our ISP which refuses to enable the "track_vars" feature, and thus the scripts fail since the $HTTP_POST_VARS is not recognized in that scenario. My question is this ... How do I read an unpredictable array of POST'ed name/value pairs other than via the $HTTP_POST_VARS technique. I anxiously await any feedback! Thanks in advance, Kip