From the CGI.pm pod

remote_user()
Return the authorization/verification name used for user verification,
+ if this script is protected.
user_name()
Attempt to obtain the remote user's name, using a variety of different
+ techniques. 
This only works with older browsers such as Mosaic. Newer browsers do 
+not report the user name for privacy reasons!

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In reply to Re: Getting Windows NT User Name using Perl by BrowserUk
in thread Getting Windows NT User Name using Perl by Anonymous Monk

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