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Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Advanced Communications Function
   ACF
      <networking> (ACF) A group of IBM SNA products that
      provide distributed processing and resource sharing such as
      VTAM and NCP.
      [Communication or Communications?]
      (1997-05-07)