I thought PostScript was PostScript!?!

[Gil Porat]

I have a Sun/PostScript question.

I've produced a PostScript program which prints nicely on our Apple Laser
Writer when I type "lpr -h myfile" (where 'myfile' is PostScript source)
from my Sun who runs Transcript.  The PROBLEM begins when I try to have a
local laser-print shop print 'myfile' on their LaserWriter, and
ultimately, on their Linotronic 2540 dpi printer.  They say that printing
fails.

So any clues?  Does lpr prepend a prologue to 'myfile' which I in turn do
not give to the print shop?

Any help would be greatly appreciated.

- Gil Porat