Have you ever wanted to know how data travels from computer to computer, around the world? Have you ever wondered how Web sites can track users or how newsgroups work? How the Internet Works shows you how with easy-to-follow, four-color visual spreads tracking the path data flows and the hardware involved. Now entering its fourth year, How the Internet Works helps you understand the latest in Internet and networking technology from cookies and data tracking to Web sound and video. Its intelligent visual approach demystifies the technology in a format that appeals to readers of all levels. Content includes explanations of digital certificates, extranets, Internet telephony, and meta-searches and scripting languages such as XML and dynamic HTML.