Does anyone have a How To guide on installing the LDAP extension on WAMP ?

I am trying to install it on a Windows XP Pro SP3 Machine solely as a proof of concept.

I was told to use this link:
http://www.php.net/manual/en/ldap.installati on.php

The ldap section is here:

http://www.php.net/manual/en/ldap.installati on.php

Here is the part that I really dont understand...