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Each chapter in this book is a self-contained lesson for you to work through at the computer. Each lesson builds on what you have learned before.
Question-and-answer sections often follow examples in this tutorial. These sections give you a little more information about what you have learned, and they tell you what to do if you see an error message. Question-and-answer sections are indicated by Q and A in the margin.
A ``Summary'' section appears at the end of every chapter. This section summarizes the commands presented in the chapter and tells you where to look in the SCO OpenServer documentation to find more information.