V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APPC
       Advanced Program to Program Communication (IBM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APPC
       Application Program to Program Converter (IBM)


V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

APPC
       Advanced Peer-to-Peer Communications (IBM, SNA, LU 6.2)


The Free On-line Dictionary of Computing (30 December 2018):

Advanced Program-to-Program Communications
APPC

    (APPC) An implementation of the IBM
   SNA/SDLC LU6.2 protocol that allows interconnected
   systems to communicate and share the processing of programs.

   (1995-02-03)