New from best-selling author, Jean Andrews, this text is designed to be the most through, step-by-step book for learning the fundamentals of supporting and troubleshooting computer operating systems. This book maps to CompTIAÂ's current A+ OS Exam. Â• Includes extensive coverage for each major operating system-chapters are devoted to Windows XP, 2000, NT, and 9x. Â• Features coverage on DOS, Linux, Mac, UNIX, and managing Windows on a network and on the Internet. Â• Maps completely to CompTIAÂ's A+ OS certification exam. Â• A+ certification icon highlights all of the material related to the exams, so you can pay close attention to the pertinent information. Â• A+ Table of Contents provides quick reference to all of A+ material. Â• CoursePrepÂ® A+ test preparation software mimics the exam environment and is included on CD. Â• Includes extensive pedagogical features, including review questions, hands-on exercises, and case projects.