User`s guide

Once in the printer, the data is used to modulate a tightly-focused
beam of light produced by a laser. The laser beam is directed to a
rotating, hexagonal mirror which causes the beam to scan across a
photosensitive print drum. Each scan results in a raster line on the
print drum. The raster lines are transferred from the print drum to
the paper by electrostatic attraction and heated-roller fusion. The
result is a high-quality, smudge-proof image on standard copier
paper.
A typical PostScript document has two parts: a prologue and a
script. The prologue contains definitions that match output
functions of the application program used. The script contains the
program the user wants to print.
The resident typefaces contained in the printer can be scaled to any
size, limited only by software and hardware considerations.
Post-Script retains the outlines, or relational blueprints, for the
resident typeface. There is a great variety of software supporting
Post-Script.
Additional information on PostScript is available in chapter 10,
“PostScript: Operator Dictionary.” More information on PostScript
may be found in three books: The PostScript Language Reference
Manual, The PostScript Language Tutorial and Cookbook, and
PostScript: Language Program Design, all published by
Addison-Wesley.
Chapter 9
9-2 PostScript: Technical Overview