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 that 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 Note presents an interesting piece of information related to the current topic.
A Tip offers advice or teaches an easier method for performing a task.
A Caution warns you about potential pitfalls and explains how to avoid them.