Finally was able to retrieve the window list from Perl

Win32 using some ugly code:<\p>

if ($^O eq "MSWin32")
{
    my @pt = `tasklist /v`; # Get the process list from Windows (NT, 2
+K, XP, 7)

    foreach my $p (@pt) # One process per line
    {
        if ($p =~ m/perl\.exe/ig) # Keep only the Perl processes
        {
            my @p2 = split(/\s+/, $p, 11); # Any space after 11 is par
+t of the window title
            my $nm = $p2[10];
            $nm =~ s/\s+$//g; # Remove trailing whitespace
            ...
        }
    }
}
else
{
    # Use interps approach
}
[download]

Thanks again for the great inputs!

Ay carumba, so you're not gonna search Tk::Wm documentation for list?