dvips: ps special

 
 5.3.2 'ps' special
 ------------------
 
 Generally, Dvips encloses specials in a PostScript save/restore pair,
 guaranteeing that the special will have no effect on the rest of the
 document.  The 'ps' special, however, allows you to insert literal
 PostScript instructions without this protective shield; you should
 understand what you're doing (and you shouldn't change the PostScript
 graphics state unless you are willing to take the consequences).  This
 command can take many forms because it has had a torturous history; any
 of the following will work:
 
      \special{ps:TEXT}
      \special{ps::TEXT}
      \special{ps::[begin]TEXT}
      \special{ps::[end]TEXT}
      \special{ps::[nobreak]TEXT}
 
 (with longer forms taking precedence over shorter forms, when they are
 present).  'ps::' and 'ps::[end]' do no positioning, so they can be used
 to continue PostScript literals started with 'ps:' or 'ps::[begin]'.
 
    Literal PostScript instructions after 'ps::[nobreak]' are _not_
 broken into lines.  This feature may be used to include PostScript
 comments, for example.
 
    In addition, the variant
 
      \special{ps: plotfile FILENAME}
 
 inserts the contents of FILENAME verbatim into the output (except for
 omitting lines that begin with %).  An example of the proper use of
 literal specials can be found in the file 'rotate.tex', which makes it
 easy to typeset text turned in multiples of 90 degrees.