It may be true that MS-DOS is dead as a stand-alone operating system. However, command syntax, parameters, parsing commands, and troubleshooting are all handled better from the command line interface than in Windows. This textbook explores these concepts using the MS-DOS window in Windows 95 or Windows 98. A careful step-by- step approach leads students from a basic to a sophisticated use of the command line interface. Each chapter includes assignments that allow students to apply their knowledge and prove their mastery of the subject through critical-thinking skills.