Help with LDAP in CGI

Hi All,

Is there a way to pick a "username" or "email address" with LDAP and CGI?
I have this code that works fine when running just as a Perl program. It gets me the logon ID of the user and I user it in the LDAP routine to find the user email address.

But if I run it as a CGI program, I cannot get get the username nor the user email address. I've tried all kind of user environment variable($ENV{'REMOTE_ADDR'}, ... ) still cannot get the email address.
Is there something I need to configure in Apache?

Please help
James

#!c:/Perl/bin/perl

use CGI ':standard';

use Net::LDAP;
  
$ldap = Net::LDAP->new( 'ldap.mycompany.com' ) or die "$@";
$mesg = $ldap->bind;

print header;

$user = &Win32::LoginName;

print "---$user--\n";

$mesg = $ldap->search( # perform a search
                        base   => "o=hp.com",
                        filter => "(&(ntUserDomainId=$user) (o=My Company))"
);
                                                                                            
$mesg->code && die $mesg->error;

my($entry);

@all = $mesg->entries;
foreach $ent (@all)
{
  foreach $att (sort $ent->attributes )
   {
     if ( $att =~ m!\bmail\b! )
      {
         print "<h1>$att ----- " . $ent->get_value($att) . "</h1>";
      }
    }
}