I and others dont mind helping you at all. Its just that in the past it seems that people have tried lengthy explanations that were pretty good only for you to dismiss them with a rude comment. Try to open up that brain a little and let it soak in...its all good. I know that right now you are trying to make pieces fit on how this stuff works...stay with it and you will have the big picture soon.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap