Apple ColorLaserWriter 12/600PS - Manual (Page 212)

Job Control
Click the Job Control tab to display the Job Control tab dialog box, which
controls such options as when the PostScript header and the PostScript error
handler are sent to your printer.
The following list describes the printer settings in the Job Control tab
dialog box.
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Printer Mode By default, the printer is set up to receive data in either binary
or ASCII format. There is no need to switch between these manually.
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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.
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