PostScript
Guide to Using Page Description Languages 1-29
If your application does not support version 4.2 of the PPD
specification, the Generic PPD file can be used. In the cases
where using the LaserWriter PPD file results in PostScript code
that contains operations not supported on DocuPrint, use the
“NULL” PPD file that is available with some applications.
Implementation limits
Features that are known to be device dependent (see the
Adobe
PostScript Language Reference Manual
, 2nd edition, for a list)
may differ from other implementations. These include
performance, VM usage, certain kinds of shading and line
thickness, some kinds of halftoning, resolution dependencies,
and certain implementation limits.