# popup.pl
use Win32;

Popup('testing popup detection...', 16, 'Some popup title');

sub Popup {
  my ($msg, $flags, $title) = @_;
  return Win32::MsgBox($msg, $flags, $title);
  die $msg;
}
##</code><code>##

# findpopup.pl
use Win32::GuiTest qw(:ALL :SW);

my @windows = FindWindowLike(0, 'Some popup title');

for my $win (@windows) {
      print "Found window $win with title '", GetWindowText($win), "'\n";
      my @children = GetChildWindows($win);
      for my $child (@children) {
        my $text = GetWindowText($child);
        next if ($text =~ /^\xff/); # you've found the icon
        next if ($text =~ /^OK|Cancel|Abort|Retry|Ignore|Yes|No$/); # you've found a button
        print "Found child $child with text '$text'\n";
      }
      
}