Using Pear Pop-3 Module to pipe email to php file with php script

I have a headache. I just installed something called FUDforum. It's a message board. It has the capacity to take email messages from a discussion group and post them into the board, while allowing posts from the board to go to the email list -- all without double posts. However, to achieve this, it is necessary to pipe mail to the maillist.php file. That's what I am trying to do: to pipe mail to this stupid file.

Well, I found a php script that says it can do this. It's located here, at FUDforum's discussion board. (not allowed to post URL)

The script calls for the following values to set:

define("SERVER_HOST", "mail.myisp.net");
define("SERVER_USER", "myusername");
define("SERVER_PW", "mypassword");
define("SCRIPT_LOCATION", "/path/to/maillist.php");
define("RETAIN_NOMATCH", True); //SET TO TRUE TO SAVE EMAILS THAT MATCH NO LIST
define("PEAR_POP3", "/usr/local/php/lib/php/Net/POP3.php"); //LOCATION OF THE POP3 PEAR MODULE

I have set all of them except one -- the last one. The one that says "pear pop 3 module." When I tried to list the path, my host told me that they did not have a pear pop 3 module installed on the server by default. They directed me to a pear site where I could download one myself.

My questions are now very simple: (a) what is a pear pop 3 module?; (b) what does it do; (c) if I wanted to get one, how do i go about it; (d) is it critical to have one of these things to get mail piped to a php file via a php script; and (e) do you know any other way to get mail piped without having a pear pop 3 thingy?

Too many questions. Just could you give me any sort of help at all??

Thanks so much for your time and patience. I appreciate it.