| The following font conventions are used in this book: Italic is used for: Pathnames, filenames, and program names Internet addresses, such as domain names and URLs New terms where they are defined Constant Width is used for: Command lines and options that should be typed verbatim Names and keywords in program examples, including method names, variable names, and class names Constant Width Italic is used for: Constant Width Bold is used for: 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. |
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| This is a warning. It helps you solve and avoid annoying problems. |
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