Detecting a logged in Windows domain user id

[Questor21]

Is there a method ($_SERVER?) to detect the id the user is logged into a Windows domain with?

For instance, if I go to a desktop in my workplace and login to a Windows domain, then hit the web site, I want that web site to know the user id I used to log into the Windows domain.

Am I reaching for the stars?

[Questor21]

Perhaps some clever use of headers()?

[Questor21]

If anyone's curious, this has pointed me in the right direction, I think.

http://seclists.org/lists/webappsec/2004/Apr-Jun/0023.html