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Defining SAP System Users 
You must define a SAP system user that the TREX admin tool (stand-alone) can use to log on to the SAP system. The SAP system user is also required so that the TREX alert server has permission to be able to test and check the RFC configuration regularly.When doing this, the user can have been created in the default client or in another client.

For security reasons, SAP recommends the following:
· Create a user in the default client that is used only by the TREX admin tool.
· Use the "System" user type.
· Assign limited permissions to the user. The user only requires permission to execute function modules remotely. It does not need any further permissions.

You can also use a user that an administrator logs on with. However, SAP advises against this for security reasons.
To determine the default client of an SAP system, use transaction RZ11. The default client is specified in the login/system_client parameter.
For more information about creating users in the SAP system, see the SAP Library at help.sap.com/nw2004s ® SAP NetWeaver.