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Hmm, that is a bit different from this, and... That may be two separate questions, @Kinnard. Perhaps start from the network aspect: ask a question that assumes familiarity with TCP/IP and the basic routing structure of the Internet, but no understanding of "onion routing".
To put Sam's question another way, are you looking for an answer suitable for a general audience ("lies we tell to children"), for folks looking to implement clients or services, for someone looking to get started using Tor, what?