This must be pretty easy for a postscript whiz, but we might not have such 
a person here.  All I want to do is add a little horizontal dotted line on 
the left side of the page at a certain position.  Is there a way to simply 
insert a line or two of postscript code into a postscript file to add such 
a thing?

FYI -- the purpose of the little line is to tell someone where to fold the 
paper so that it will fit correctly into an envelope, displaying an 
address in an envelope window.

Mike