Constant Willison
is used for HTTP headers,
status codes, MIME content types, directives in configuration files,
and computer output in text
Italic is used for filenames, pathnames,
newsgroup names, Internet addresses (URLs), email addresses, variable
names (except in examples), terms being introduced, commands, options/switches,
program names, subroutine names, functions, arrays, operators, methods,
and hostnames
ALL CAPS is used for environment variables, HTML
attributes, and HTML tags (within angle brackets
<>)
