I want to use Win32::AuthenticateUser which seems to fit the bill perfectly. Unfortunately, I don't see it in CPAN and ppm doesn't have it, and it's not with the base load of activeperl on windows2000 server. But this is the functionality I need: use Win32::AuthenticateUser; AuthenticateUser("domain", "user", "passwd"); But it returns: Can't locate Win32/AuthenticateUser.pm in @INC (@INC contains: I:/Perl/lib I:/Perl/site/lib .)