Now if you were using IIS it may be different

/me ducks. I know...I know. ;-)

If you use Integrated Authentication on IIS the user revealed by CGI::remote_user(); would be the OS username. Here is the code: 

#!c:\perl\bin\perl.exe -w

use CGI;
my $username = CGI::remote_user();
print "Content-type: text/html\n\n";
print "<h3>Hello $username</h3>";

[download]

And here is the reply

Hello viper\blm

--blm--

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

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