The /usr/lib/lp/locale/C/ directory contains .ps print page layout files common for this mode of printing. A description of how to customize these files is provided in Adding and Customizing prolog Files
If the -D or -P option is not given in the command line, and /usr/openwin/lib/locale/$LANG/print/prolog.ps exists, then the prolog.ps file is prepended to the output. Depending upon the print style of the .ps prolog page, the layout file is also prepended to the output.
This method of printing makes use of PostScript font files only. Customization of prolog.ps files is described in Adding and Customizing prolog Files.