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Convention
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Meaning
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Courier text
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Courier is used for text displayed on the screen, and text that you enter. For example, Courier font (typewriter font) is used for code samples, structure types, and command-line text.
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italic text
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Italic is used for:
Simple emphasis (Example: Do not change ).
Titles of books.
Variable text. For example, in sample code and command-line text.
Key words when they are first defined in the text.
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Special keys are represented by symbols like these on the left when they must be entered from the keyboard: in many instances the use of the key is assumed. Literal letter key-strokes are also represented in this way. An ampersand indicates that you should press the last key while holding the previous one(s) down, as in  &&
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Note:
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Information of special interest is being presented.
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