define verb UNSDL
   image exe$dir:unsdl
   parameter P1 , label=INFILE , prompt="File"	! this is the .SDI file
      value (required)
   qualifier LANGUAGE	! i.e. CC for the SDLCC module
      nonnegatable
      value (required)
   qualifier OUTPUT	! name of an output file, if not given defaults
      default		! to name of input file with filetype added at end
      value (type=$outfile)	! i.e. .H for CC module