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