“Upgrading and Repairing PCs, 18th edition” by Scott Mueller; book and DVD, $60 from¬†

The title tells you most of what you need to know about this book, and the CD, in which Scott Mueller explains the contents of each chapter, tells you that true nerds still exist. Thank heavens for that. One of the new things in this edition —Upgrading PCs¬†note that it’s the 18th — explains how to set up a wireless network that is practically impenetrable from the outside.

The wireless security section is particularly timely these days for many businesses. Discount store chain TJ Maxx had 45.7 million credit card numbers stolen this year, for instance, in what is euphemistically known as an “unauthorized intrusion.”

The company used the old WEP encryption system for its data. WEP stands for Wired Equivalent Privacy and its code can be broken by software that’s available for free on the Web. Many businesses still use WEP encryption, however, because it’s cheap.

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