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Overview -- Interfacing with C


   Clipper supports user-defined functions written in C through
   the Extend System.  This is a somewhat higher level interface
   system than the usual CALLs in that you use specialized
   functions for passing parameters to and from the routine.
   These functions reside in the Clipper library.  Your C routine
   must declare them by including EXTEND.H.  This file contains
   the program declarations and macro definitions necessary to
   write user-defined functions in C.