Dell Dimension 2100 System Reference Manual page 2

Keycaps are labels that appear on the keys on a keyboard. They are
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enclosed in angle brackets.
Example: <Enter>
Key combinations are series of keys to be pressed simultaneously
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(unless otherwise indicated) to perform a single function.
Example: <Ctrl><Alt><Enter>
Commands presented in lowercase bold are for reference purposes
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only and are not intended to be typed when referenced.
Example: "Use the format command to . . . ."
In contrast, commands presented in the Courier New font are part of an
instruction and intended to be typed.
Example: "Type format a: to format the floppy in drive A."
Filenames and directory names are presented in lowercase bold.
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Examples: autoexec.bat and c:\windows
Screen text is a message or text that you are instructed to type as part
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of a command (referred to as a command line). Screen text is presented
in the Courier New font.
Example: The following message appears on your screen:
No boot device available
Example: "Type md c:\programs and press <Enter>."
Variables are placeholders for which you substitute a value. They are
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presented in italics.
Example: DIMM_x (where x represents the memory socket designation).
Technical Overview: Dell™ Dimension™ 2100 System
Reference