You need to create data for configuring the CICS® TCP/IP environment.

The Configuration File contains information about the CICS sockets environment. The file is organized by two types of objects—CICS instances and listeners within those instances. The creation of this data set is done in three stages:

1. Create the empty data set using VSAM IDCAMS (Access Method Services).
2. Initialize the data set using the program generated by the EZACICD macro. The first two steps are described in JCL for the configuration macro.
3. Add to or modify the data set using the configuration transaction EZAC. This step is described in Customizing the configuration transaction (EZAC).¹