dvips: Literal headers
5.3.3 Literal headers: '!' '\special'
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You can download literal PostScript header code in your TeX document,
for use with (for example) literal graphics code that you include later.
The text of a '\special' beginning with an '!' is copied into the output
file. A dictionary 'SDict' will be current when this code is executed;
Dvips arranges for 'SDict' to be first on the dictionary stack when any
PostScript graphic is included, whether literally (the '"' special) or
through macros (e.g., 'epsf.tex').
For example:
\special{! /reset { 0 0 moveto} def}
Info Catalog
dvips: ps special
dvips: Literal PS
dvips: PostScript hooks