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Design Structure

   The goal of an overlay design is to create overlays containing
   functionally isolated sections of the program that execute
   independently of other sections.  These sections, or "application
   segments," may contain one or more program, procedure, user-defined
   function, or format ((.prg) or (.fmt)) files.

   In anticipation of using overlays, divide your (.prg) files into
   logical files and use a script file to compile the set of associated
   (.prg) files into a single object file.