Stew

Thank you all for the helpful advice. I have had some trouble trying to import the Active DS Type Library (registry problem), but nothing that cannot be sorted out today. In the meantime, following your general reading suggestions, I have been able to use ADO to access LDAP through OpenQuery and now have a working two-stage authentication process, first to check that the username/password combination is valid, then to verify membership and permissions within an AD group. Actually didn't take me nearly as long as I had feared it might, and although the current solution is probably not the best it will suffice until I can fix the other problems and familiarise myself further with the workings of AD. Thanks again for your helpful replies.

I have been tasked with updating login verification in a number of Delphi applications to use Active Directory rather than the existing method of reading from an internal db table. I have never used AD in any application before, so I have been looking on line for helpful files/components that will allow me to access basic user attributes in AD. Everything I have come across so far is relatively old and frequently the links that are cited no longer work. Does anybody know of helpful AD access components, please? I m using XE3. Thanks for any pointers