ESF User Exit modules often have configurable options, to alter their behavior, enable tracing messages, and so on.
The User Exit module has access to the configuration text area provided to ESF by the security configuration. That is the Configuration Information text area that appears on these three pages in Enterprise Server Administration:
In that Configuration Information text, you can add a section for use by the User Exit. By convention, the section name [user exit] is reserved for this purpose. (You can use any section name, but it's possible other names could conflict with sections defined by later releases of Enterprise Server.)
See Configuration options for the Referential Integrity User Exit for an example of a user exit configuration.
Since the esfadmin command-line utility does not use a security configuration defined in Enterprise Server Administration, if you need to supply user exit configuration parameters to it, you must use a text file and the -c command-line option. See To enable the ESF user exit through configuration for an example.