Conventions Used in This Book

The following font conventions are used in this book:

Italic: Used for pathnames, filenames, program names, Internet addresses, such as domain names and URLs, and new terms where they are defined.
Constant Width: Used for command lines and options that should be typed verbatim, and names and keywords in program examples. Also used for parameters, attributes, expressions, statements, and values.
Constant Width Italic: Used for replaceable items, such as variables or optional elements, within syntax lines or code.
Constant Width Bold: Used for emphasis within program code.

Pay special attention to notes set apart from the text with the following icons:

This is a tip. It contains useful supplementary information about the topic at hand.

This is a warning. It helps you solve and avoid annoying problems.

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