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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 T