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(dvips.info)Header files

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PostScript header files
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  "Header files" are bits of PostScript included in the output file;
generally they provide support for special features, rather than
producing any printed output themselves.  You can explicitly request
downloading header files if necessary for some figure, or to achieve
some special effect.

  Dvips includes some headers on its own initiative, to implement
features such as PostScript font reencoding, bitmap font downloading,
handling of `\special''s, and so on.  These standard headers are the
`.pro' files (for "prologue") in the installation directory
`$(psheaderdir)'; they are created from the `.lpro' ("long prologue")
files in the distribution by stripping comments, squeezing blank lines,
etc., for maximum efficiency.  If you want to peruse one of the
standard header files, read the `.lpro' version.

  The PostScript dictionary stack will be at the `userdict' level when
header files are included.

Including headers from TeX

Including headers from the command line

Headers and memory usage