Path: utzoo!news-server.csri.toronto.edu!rutgers!usc!rpi!batcomputer!munnari.oz.au!manuel!anucsd!csis!ken
From: ken@csis.dit.csiro.au (Ken Yap)
Newsgroups: comp.lang.postscript
Subject: Re: How can I tell if a file is "postscript"
Message-ID: <1991Mar12.040525.13322@csis.dit.csiro.au>
Date: 12 Mar 91 04:05:25 GMT
References: <487@appserv.Eng.Sun.COM> <1461@vidiot.UUCP> <2873@van-bc.wimsey.bc.ca>
Organization: CSIRO Division of Information Technology
Lines: 8

As a side note, there are some PS interpreters that understand
structured comments. A case in point is the Dataproducts 1260. How do I
know? When an area larger than A4 was specified for the bounding box, a
bug in the interpreter was tickled and characters came out 2x tall. I
was most annoyed.

However the leading %! is noted by the print filter or spooler in all
the systems I know.