as you can see your questions are not very welcome on the mailinglists, therefore i advice you to have a look at this book if you are interested in BSD's technical background
Title: The Design and Implementation of the 4.4BSD Operating System
Authors: McKusick, Bostic, Karels and Quarterman
Publisher: Addison-Wesley
4.4BSD is what NetBSD, OpenBSD and FreeBSD are basing on.
For Linux i cant help you.
Take this approach to read about technicals issues yourself, by finding the differences yourself you learn much more than being told.
greets, josef
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