The following is a list of the typographical conventions used in this book:

Italic: Used to indicate new terms, example URLs, filenames, file extensions, directories, program names, and, of course, for emphasis. For example, a path in the filesystem will appear as /Developer/Applications.
Constant width: Used to show code examples, anything that might be typed from the keyboard, the contents of files, and the output from commands.
Constant width italic: Used in examples and tables to show text that should be replaced with your own user-supplied values.
Color: The second color is used to indicate a cross-reference within the text, and occasionally to help keep the author awake during late-night writing binges.

You should pay special attention to notes set apart from the text with the following icons:

This is a tip, suggestion, or general note. It contains useful supplementary information about the topic at hand.

This is a warning or note of caution. When you see one of these, your safety, privacy, or money might be in jeopardy.

The thermometer icons, found next to each hack, indicate the relative complexity of the hack: