Well, domains don't really have an OS name. You can have several different types of computers - with different OSes - running in the same domain.
Each individual computer does have an OS name that you can retreive - and that's what Win32::GetOSName() does - it retreives the OS name of the local machine.
To get the OS Name of a remote machine, there are several ways. One way is to use Win32::TieRegistry to query the registry of the remote machine. Another is to use Win32::OLE together with WMI. Here's an example:
use strict;
use Win32::OLE qw( in );
my $Computer = 'myworkstation';
my $WMIServices = Win32::OLE->GetObject(
"winmgmts:{impersonationLevel=impersonate}//$Computer"
) || die ("Could not connect to $Computer");
my $OSCollection = $WMIServices->InstancesOf( "Win32_OperatingSystem"
+);
foreach my $OS (in $OSCollection ) {
print "OS = $OS->{Caption}\n";
}
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