Document TCP peer-to-peer connection setup in Chapter 13

[de0u]

I realize that you might reject this as extraneous, or substantially re-word my suggested text, but as the book stands it furthers the common misconception that TCP supports only the client-server connection pattern. In fact if two programs specify each other's IP addresses and port numbers via connect() TCP is supposed to set up the connection.

[marijnh]

Thanks. But I do indeed think that, at the level of this book, this is extraneous. While it is possible to use TCP like this, it's rarely done, and not really relevant for people learning web basics.