Understand your laptop, power it up, and play it safe. Follow Dan's plan for picking the perfect laptop and hit the road. You hold in your hands the next-best thing to a laptop itself - the complete fun-and-easy guide to choosing and using the laptop that fits your needs. Here's Dan Gookin's should-be-patented five-step process for buying a computer plus the complete laptop lowdown - power management, wireless access, special security issues, and more. Discover how to: decide what you want and less…