What you need to do is trap the signal that is sent when the program exits. I can't remember off the top of my head what that is called on Windows - but if you print keys %SIG you should be able to tell.

Once you get it figured out which signal you need to trap, put something like the following in your code (before the MainLoop).

$SIG{KILL}=sub {
        kill 15 => $kid;
        exit;
    };
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Note, you will also want to read through perlipc for more info regarding trapping of signals.