Understanding LDAP or MS Active Directory authentication and Informix

Greetings, I'm hoping someone understands what is necessary to enable LDAP or AD authentication with Informix. I'm trying to understand if a specific database ID w/connect needs to be present or if a user is part of a group in LDAP/AD, connect can be granted to the group name in the DB. I'm having a hard time believing that a DB ID does not exist in the DB. Or if I'm just not understanding what is required to make LDAP work, could some explain it to me. IDS 9.40 FC2 or FC8 HPUX 11.11 Thanks for any insight you can provide.