Apple LaserWriter 12/640 PS - Manual (Page 164)

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PostScript Header The PostScript header contains instructions that a
PostScript printer needs to print documents created by the driver. If
your printer is connected directly to your computer only, you can save
time by choosing the Download button to send the PostScript header only
once—when you switch on your printer. Download Each Job tells the
driver to send the PostScript header with every document. Already
Downloaded tells the driver not to send the PostScript header with
documents. Download tells the driver to send the header when you choose
the Download button.
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Error Handler Tells the driver to send a special PostScript error handler with
every document you print. The error handler prints a page with a
PostScript error message when a document fails to print correctly. You can
use this option as an aid in troubleshooting print job problems.
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Font Control This advanced feature tells the driver not to download fonts
when printing documents. Use this option if you know that the fonts you
use in your documents are always available to the printer.
Watermark
Click the Watermark tab to display the Watermark tab dialog box, which
contains options for defining, editing, and deleting watermarks.
164 Chapter 7