Programming Intelligent Agents for the Internet by Mark Watson
Bots and Other Internet Beasties by Joseph Williams
Internet Agents Spiders Wanderers Brokers and Bots by Fah-Chun Cheong
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"Why do I get the feeling that your web robot is like the robot from the
old t.v. series Lost In Space. Most of the time your bot is benign and
helpful, but once in a while it's Crush! Kill! Destroy! and you're trying
to harm Will and Judy?