C programming SAP..,??

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In this documentation, you will learn how to implement program-to-program communication between SAP Systems (R/3 or R/2) and with external programs and systems using SAP’s CPI-C interfaces.
CPI-C programming is only required in the following cases:
·        Your program communicates with systems that do not support RFC  (R/2 before Release 5.0D).
·        You want to define your own protocol on the basis of CPI-C.
·        You want to change an existing program which contains CPI-C calls.
The Remote Function Call interface further simplifies the implementation of communication. RFC is an SAP interface based on CPI-C. For more details on RFC, refer to the documentation RFC Programming in ABAP.
For details on configuration, please refer to the documentation BC - SAP Communication Configuration.
The following topics are discussed in this documentation:
SAP Communication
Programming under Various Constellations
CPI-C Implementation in ABAP
CPI-C Interface in C
Asynchronous Data Transfer With Q-API
Using SAP Test Programs
Error Analysis
Special Features on R/2 Hosts
Example Programs
Con

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