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 examples.
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.