Enterprise Server has a set of default users that are used when no user is logged on for CICS, JES, IMS or ESMAC authentication. These users and the associated environment variables are:
Using the environment variables, the default users can be overwritten by the users of your choice. For instance we could overwrite the ESMAC default user using in the region configuration.
configuration: [ES-Environment] ES_USR_DFLT_ESMAC=ESMACUSR