The only Apple-certified book on Mac OS X, this comprehensive reference takes support technicians and ardent Mac users deep inside their operating systems, covering everything from networking technologies to system administration, customizing the operating system, command-line programming, and more. Keyed to the learning objectives of the Apple Helpdesk Specialist certification exam, the lessons in this self-paced volume serve as a perfect supplement to Apple's own training class and a first-rate primer for computer support personnel who need to troubleshoot and optimize Mac OS X as part of their jobs. Self-quizzes and chapter tests reinforce the knowledge gained along the way.