The ultimate goal is to have one place to create logins and have them be valid on all machines, linux, mac or windows. Ldap takes care of this for linux (and mac, I think). I’ve just installed a program called pGina that allows ldap to work for windows as well. In the test in parallels on my mac laptop, it worked fine. The only problem was in mounting the samba drives, but I think I’ll be able to work with that.