I remember when I originally read this thread that I definitely agreed with those who felt you were trying to develop a cracking tool. They felt, on that basis, that it would be improper to answer your question.
I can see from what you have written that you have stated a somewhat legitimate reason for your qustion, but I still feel that it would be improper to answer your question (to be fair, I haven't used IO::Sockets, so I couldn't answer the question even if I wanted to).
Basically, what you are asking is for help creating security by obscurity. This is arguably the worst method of creating security. If, for some reason, a cracker wanted to take a run at your box, do you really believe that sending out signals suggesting your box is 3 different OSs is really going to fool anyone? If you have a moderately secure box, it might fool the casual user, but that's about it.
Learn how to tighten down your box properly and you won't have to worry about useless tricks like this.
Cheers,
Ovid
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