This new thread appears to be a duplicate restatement of the one you began yesterday here:
http://www.daemonforums.org/showthread.php?t=5069
I am not a FreeBSD user. With that out of the way....
The primary tool you should invesigate is LDAP -- particularly, OpenLDAP.
LDAP provisioning is discussed in the FreeBSD Handbook, but not interoperation with Windows. If a BSD platform is to act as a Windows Primary Domain Controller (PDC) for authentication, integrated with LDAP, you will need Samba.
There are plenty of "howto" documents you can find with Google -- I recommend you research any such documents found in the wild on the Internet very carefully, and be sure you understand any recommended commands and configuration settings completely before implementing them.