Language
Document Structuring Conventions (DSC). Please see that manual for
details on the available comments and their meanings. In
particular, the %%IncludeFeature comment allows a
device-independent means of controlling printer device features. So
the PostScript Printer Description Files Specification will also be
a useful reference.</p>
<p>The comment string must begin with a percent character (%) and the
total length of the string (including any initial percent
characters) must not exceed 255 character