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Background documentation Architecture of the SAP Gateway  Locate the document in its SAP Library structure

Each instance of an SAP System has a gateway. The gateway enables communication between work processes and external programs, as well as communication between work processes from different instances or SAP Systems.

Gateway Processes

The SAP Gateway is made up of various processes:

        Gateway read process

        Gateway monitor

These processes are described in the following topics.


Earlier gateway releases that support DCAM and SNA have additional gateway work processes (gwwp, gwwp.exe).

Gateway Read Process

Gateway read (gwrd, gwrd.exe) is the main process in the gateway system.

It is started by the application server (dispatcher) and checked by it periodically.

The gateway reader receives and processes all CPI-C requests.


If the executable gwrd program is called without parameters or with the switch -help, the program outputs a description of the possible command parameters, as well as all the patches.

Gateway Monitor

The gateway monitor (gwmon, gwmon.exe) is used to analyze and administer the SAP Gateway.

When you start it, you initially get a list of active CPI-C connections. You can call up all the other monitor functions via a menu.

You can monitor the gateway from the SAP System (transaction SMGW) or from the operating system.

For more information see:

Using the SAP Gateway Monitor in the SAP System

Using the SAP Gateway Monitor Outside the SAP System

Further Information

For more information on the gateway architecture see:

The SAP Gateway and the SNC Interface

Load Balancing for Registered Programs

Memory Management of the SAP Gateway





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