Active Directory and Domino LDAP

Here is my question. Has anyone or is it possible to allow windows users login via active directory and/or domino ldap?

Since all my users have windows 2000 or windows xp operating systems I would like them to authenticate to domino’s ldap service instead of active directory user listings. I believe there is a way to configure ldap secondary services which could include domino’s ldap. If secondary service is possible could I use that ldap service instead of creating all users in AD.

Any ideas?

Ted