  9 Marking Words and Phrases   9.1 Indicating Definitions,
Commands, etc.  Texinfo has commands for indicating just what
kind of object a piece of text refers to. For example,
metasyntactic variables are marked by @var, and code by @code.
Since the pieces of text are labelled by commands that tell what
kind of object they are, it is easy to change the way the
Texinfo formatters prepare such text. (Texinfo is an intentional
formatting language rather than a typesetting formatting
language.)  For example, in a printed manual, code is usually
illustrated in a typewriter font; @code tells TeX to typeset
this text in this font. But it would be easy to change the way
TeX highlights code to use another font, and this change would
not affect how keystroke examples are highlighted. If straight
typesetting commands were used in the body of the file and you
wanted to make a change, you would need to check every single
occurrence to make sure that you were changing code and not
something else that should not be changed.