Jim is entirely correct -- in most cases the PostScript level is just about
the last thing you have to worry about. This is due to the simple fact that
Level 2 interpreters are hard to come by, and as a result people write
PostScript code that will work with either Level 1 or 2. Other information,
like whether or not a color display is needed to display the document
properly, are much more important. There are, however, no simple ways to
determine this information and extract it to a small sensible set of
attributes. The document structuring conventions are fairly complex (the
syntax is trivial, but there are lots of attributes plus order
dependencies).
A dummy application is not quite the right word for the thing that solves this
problem, incidentally. This gadget is c
alled a document manager, and it is
a fairly well-understood bit of PostScript-ware. Document managers are never
essential to the use of PostScript, but when choices between different devices
and whatnot must be made, they are essential, and indeed, the only way to
go.
Ned