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 CompTIA��'s current A+ OS Exam. ����� Includes extensive coverage for each major operating system-chapters are devoted to Windows XP, 2000, NT, and 9x. ����� Features coverage on DOS, Linux, Mac, UNIX, and managing Windows on a network and on the Internet. ����� Maps completely to CompTIA��'s A+ OS certification exam. ����� A+ certification icon highlights all of the material related to the exams, so you can pay close attention to the pertinent information. ����� A+ Table of Contents provides quick reference to all of A+ material. ����� CoursePrep���� A+ test preparation software mimics the exam environment and is included on CD. ����� Includes extensive pedagogical features, including review questions, hands-on exerc