For a basic solution: 
use strict;
use Win32;
use Win32::Lanman;

my %info;
my $server="pdc";
my $user="username";

if (Win32::Lanman::NetUserGetInfo($server, $user, \%info)){
        print "$info{name} is $info{full_name}";
}
else {print Win32::Lanman::GetLastError()}

[download]
I'm sure you can clean up the error messages a bit (something with getlasterror? can't quite remember the syntax for that though). But this should do the trick as is..

UPDATE: Found the easy syntax for error messages and changed the above

In reply to Re: Win32:Getting the Full Name from User Manager by the_slycer
in thread Win32:Getting the Full Name from User Manager by OzzyOsbourne

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