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1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Gensym Standard Interface
   GSI
      <programming> (GSI) A set of C libraries and programming
      tools used to interface G2 to external systems.
      Commercially available bridges are available to SCADA
      systems and PLCs.
      (1997-02-11)