A must read technote
Lotus Notes/Domino Directory FAQ
http://www-1.ibm.com/support/docview.wss?rs=463&uid=swg21214515
Ken you’ve been replaced! 
Lotus Notes/Domino 6 Directory FAQ
For questions about the Domino 6 Directory, including LDAP schema, multiple directories, security, and more, refer to this document maintained by Ken Lin. This FAQ offers a compilation of links to many Domino Directory-related
JYR