ASDen, you seem to be an extremely stubborn person.
I have read this entire post, and you have yet to show any proof that what you are doing is, in fact, multi-threading. PHP does not support it. It just doesn't. Are you sure that you even know what multi-threading is, because each time you try to explain it... You simply don't. You just state that your code accomplishes it.
Look at a language that natively supports multi-threading and how it works.
Hell, I am fairly sure that what you are doing doesn't even run the scripts simultaneously. When you use JavaScript to accomplish this, you are making multiple requests, leaving the rest of the process to the client's internet connection, not the server. I'm not sure how much experience you have with dial-up connections (as many people are so spoiled with their "blazing fast" internet speeds

), but requests are not made instantly, and neither are the responses from the server. Though they may *seem* instant on broadband, they are not.
I'm not convinced.