SAP Communication: Configuration (BC-SRV) 
This subject area is aimed at system and network administrators. You will learn about the configurations necessary for SAP Systems (R/3 or R/2) to be able to communicate with each other and with external programs and systems.
The configuration depends upon the system platforms in use and the constellation. You will receive guidance on this in the second topic "Configurations Overview".
For information on CPI-C programming, refer to the following documentation:
BC - SAP Communication: ProgrammingFor information on RFC-based programming, refer to the following documentation:
Remote Communications
Configurations Overview
SAP Gateway
Side Info Tables
MVS/VSE Host Systems
Communications Subsystems for SNA
BS2000 Host Systems
Hosts and Services in the TCP/IP Network
Using SAP Test Programs