Thanks - this is just the information on Windows that I hoped to get from Perlmonks! I wasn't aware that Windows has a process (message) queue. So far, I was under the impression that for a message queue you always needed a window handle.
As for sending "signals" from non-Perl processes, I think this is a lesser priority, because any non-Perl process can always use the moral equivalent of
system('perl','-e',"kill SIGWHATEVER => $pid")
to send a signal to a Perl process. I think code injection is an interesting toy but far too unreliable/difficult if you want to use IPC. If the easier alternative is shared files, code injection does not look good :).
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