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The following is from the "Programming and Debugging aids" section of the
"Inside LaserWriter" document from Apple Computer:

***
Instructions for Spooling, Editing and Downloading a Postscript file from
a Macintosh application.

     In normal use, the Macintosh Print Manager sends a Postscript file to
the printer each time that it wants to print a document on LaserWriter.  It
is possible to spool that file to disk and look at the result for debugging
purposes.  It is also possible to edit the spooled file and then transmit
it to the printer.  This feature allows advanced users to add features to
Macintosh documents that are not supported by the current Macintosh Print
Manager (translation and rotation on the page or rotated text, for example).
The syntax for this spooled Macintosh file will be defined in the final
release of Inside LaserWriter, but it is not currently available.

To Spool a Postscript File.

     When a Macintosh application is run to print a document on LaserWriter,
the Postscript output that is generated can be spooled to a disk file instead
of sending it to the printer by using the following procedure:

     1. Select "Print" from the application's file menu in the usual way.
     2. When the print dialog appears, click OK in the usual way.
     3. Immediately press the Control and F keys simultaneously and hold
them down until the message "Creating Postscript file" appears on the screen.
     4. Quit from the application.
     5. A file labelled "Postscript" should be on the desktop.  (If there was
a previous file labelled "Postscript" on the desktop, it will have been
destroyed.)
     6. Rename the file as something other than Postscript if you want to
keep it so that it is not destroyed the next time that you spool a Postscript
file.
***

The "Inside LaserWriter" package includes the PostScript Language Manual,
PostScript Cookbook, Adobe font information, and some information about the
LaserWriter and AppleTalk protocals.  It also includes two diskettes
that contain 'Programming and Debugging Aids' and 'Screen Fonts'.  The
package costs $75 (+ sales tax for CA residents), and is available from:

     Apple Computer Mailing Facility
     467 Saratoga Avenue, Suite 621
     San Jose, California  95129

There is another document which describes AppleTalk in more detail,
called "Inside AppleTalk" (not surprisingly).  It also costs $75, from
the same source.  It is necessary for developing peripherals which connect
directly to AppleTalk, such as a standalone file server.

     Gary Crum, crum@utah-cs
     University of Utah

PostScript is a trademark of Adobe Systems, Inc.
LaserWriter and AppleTalk are trademarks of Apple Computer, Inc.