My understanding of the NT groups options is that it will allow you to select NT groups when you set up member lists for member only forums.
Having said that, I haven't been able to get NT groups or NT autologin (or member lists for that matter) working on my site as yet, so I wish you luck.
thanks, that makes sense. I have not created any member-only forums; so that is why I probably did not see the need for feature.
FYI I found NTAuth was easy to setup once I had installed ADSI from the microsoft site and selected challenge/response (only) in IIS.
On a different note, I am having plenty of problems across domains (where users get a GetObject error); and would like to be able to revert them back to a manual DB logon when NTAuth fails. But that seems to be impossible.