A range of features--crossreferencing, "OOPS!" troubleshooting tips, "Techno Nerd Teaches" sidebars, and "Speak Like a Geek" definitions--combine to introduce the novice to the mysteries of this linked conglomeration of networks. Original. (Beginner).
Kept more as a curio - I used this at the time when it really was still the infant internet. I think the reason why I keep it was the concept on breaking a wall, as I emailed the author and he emailed me back. At the time (1995), this was very spooky.