PEAR::HTTP_REQUEST documentation and how do I use phpDocumenter against ALL of PEAR?

Hi, I am PHP & PEAR newbie.... I am looking for the documentation for HTTP_Request -- am I missing it in some obvious place, or does it really not exist as part of the PEAR manual, or as part of pear.php.net? If I run phpDocumenter against all of the PEAR library on my machine, will I get anything useful out of that, or is PEAR documentation not quite ready for prime time yet? How do I run phpDocumenter against PEAR? And where is a goood place to find PEAR package documentation? Thank you, Jerry Asher