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SAP Communication: Configuration 
This documentation 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.
For basic information about communication between SAP Systems, see SAP Communication.

If you want to connect an SAP Web Application Server System to an external system, SAP recommends you use the standalone gateway 4.6D.
This documentation describes the
SAP Gateway with
regard to how to use, configure, and monitor it.
In the documentation on SAP Web Application Server Release 6.10 you will find the following topics:
· Configurations Overview
· Maintaining MVS/VSE Host Systems
· Communications Subsystems for SNA
· BS2000 Host Systems
· Hosts and Services in the TCP/IP Network
· Using SAP Test Programs
· Connecting R/3 and R/2 on an IBM Host
Choose SAP NetWeaver ® SAP Web Application Server ® SAP Web Application Server 6.10 and then in the SAP Library SAP Web Application Server ® Basis Services/Communications Interface ® SAP Communication: configuration.
For information on CPI-C programming, refer to the following documentation: BC - SAP Communication: Programming
For information on RFC-based programming,
refer to the following documentation:
Remote
Communications