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Conventions Used in This Book
This book uses different typefaces to differentiate between code and plain English, and also to help you identify important concepts. Throughout the lessons, code, commands, and text you type or see onscreen appear in a computer typeface. New terms appear in italics at the point in the text where they are defined. Additionally, icons accompany special blocks of information:
 | A "By the Way" presents an interesting piece of information related to the current topic. |
 | A "Did You Know" offers advice or teaches an easier method for performing a task. |
 | A "Watch Out" warns you about potential pitfalls and explains how to avoid them. |
