Normal people aren't supposed to know OS internals, that's the whole point of UI abstractions! They have more important matters to deal with when they use a computer. OS X isn't any different from other OSs in this regard: your mom doesn't know what the registry is.
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When I say nobody, I mean no normal people. By posting here, you automatically exclude yourself from that group. Your mom doesn't know how OS X works.
Normal people aren't supposed to know OS internals, that's the whole point of UI abstractions! They have more important matters to deal with when they use a computer. OS X isn't any different from other OSs in this regard: your mom doesn't know what the registry is.