LDAP authentication against a w2k server domain controller

I need to authenticate drupal users within an intranet, against already existing acounts from a win2k domain controller. I am using the ldap_integration module but I know too little about Active Directory and LDAP. I don't understand the "dn=xxx,dc=yyy" syntax, so I don't know what to put into most configuration fields within the conf.php file of this module.
It particularly requires the following configuration values

NTLM integration would also be good, but I am not using Windows nor IIS for drupal but Debian and Apache instead. Also, not all clients will be IE because I am trying to incorporate Opera and Firefox into our organization, and some members are already hooked up with these alternative browsers.
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