* Does not assume prior knowledge, yet goes beyond introductory level

* Patient, step-by-step instruction with a minimum of jargon

* Recognizes the increasing use of home systems and public systems by corporate users (telecommuters).

Thomas C. Greene is associate editor of The Register, the leading independent IT news daily, where he has been a senior editor and columnist for 5 years. Tom covers cybercrime, computer and network security, and Washington politics and legislation related to information technology.

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