General Purpose PostScript Generating Utility
7.3.3.1 Special characters
`$' is ignored in PreTeX for compatibility with LaTeX,
and `%' introduces a comment. Hence they are the only symbols which
have to be quoted by a `\'. The following characters should also be
quoted to produce good LaTeX files, but are accepted by
PreScript: `_', `&', `#'.
Note that inside a command, like \textbf, the quotation
mechanism does not work in PreScript (\textrm{#$%}
writes `#$%') though LaTeX still requires quotation. Hence whenever
special characters or symbols are introduced, they should be at the
outer most level.
