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Configuration of the RFC
Connection 
The following sections describe the steps that you carry out if the application and TREX are communicating using an RFC connection.
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1. Define the SAP system users.
2. Determine the SAP system connection data
3. Configure the RFC connection in the TREX admin tool using the TREX admin tool (stand-alone).

For more information about how you start the TREX admin tool (stand-alone), see Starting the TREX Admin Tool.
For more information about the RFC connection and handling connection and configuration errors, see the documentation on the TREX admin tool (stand-alone). You can find this documentation in the SAP Library at help.sap.com/nw2004s ® SAP NetWeaver.