Still in search of lost printing

[Peter Alcibiades]

"Cross-platform note:  On Mac OS and Windows systems, the print command uses 
the current printer. On Unix systems, the printcommand creates a PostScript 
file and runs the program specified in the printCommandproperty, with the 
file as input."

This is from the 2.9 dp-4 dictionary.

Does anyone know where this PostScript file is created?  It would help track 
down the problem to know if it is failing to create the file, or failing to 
print it once created.  If the latter there would obviously be workarounds 
using shell().

Peter