NT user information

Heya folks, this is connected to another post i made here http://www.webmaster-forums.net/showthread.php?s=&threadid=19596
about gaining NTLM information using apache/php on a windowsxp box that is not a dedicated web server, not a PDC either. Using the module didnt seem to work, now im hoping for a scripting solution.

I'm trying to get NT usernames captured as a variable as people hit the webserver, I've seen some things alluding to this such as

header('WWW-Authenticate: NTLM', True);

but the use of this is a mystery 2 me, its only mentioned once, and even then only using it as a comparison against a text file with users in it, which I dont want. I just need to know the users logon name which I would normally obtain through ASP via

request.servervariables("AUTH_USER")

Need help bad folks, if I cant get this done, I'll abandon php/apache as a viable alternative to asp/vbscript/iis in an Intranet environment, and wont recommend it. I don't see a point in Open Source, if its not flexible to its environment, adaptable to security types and AWARE of the environment it is installed on(a windows machine).

I wont use text files as a security system, this seems rather pathetic and insecure, and like a database of users and passwords, would only be a duplication of the effort undertaken to maintain user logins and permissions in the PDC NTLM system.