what, you mean the whole produced page?
tricky. how about this;
make a copy of the producing script, and save it on the server.
take the $HTTP_POST_VARS array, and generate a php variable creation statement from it. take this string and save it in a temporary file.
append the script to this file, and save.
now, run the script from the command line using exec, and pipe the results to another temporary file.
then, open the result file with file() and delete both the temp files.
it's a hack, but it should work.
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rad