Everything you always wanted to know about Wi-Fi but were afraid to ask. This comprehensive guide covers the increasingly popular wireless technology as both a tool for networking your home computers and as a way to connect to the Internet when you're out in the world. Includes product reviews and practical tips such as "Top Ten Ways to Avoid Wi-Fi Hijacking." The handy hotspot finder, a database of nearly 42,000 public places in 60 countries where you can log on, includes pricing.