The application is shipped in the IPCS library. When you start the application, the system needs to concatenate the WLM/IPCS data sets, allocate some data sets, and then invoke the WLM panels.
ex 'SYS1.SBLSCLI0(IWMARIN0)'If you have different data set conventions for your IPCS data sets, or if you use storage managed data sets, you should use the WLM application exits IWMAREX1 and IWMAREX2. For more information about IWMARIN0 and how to customize the application with the WLM exits, see Customizing the WLM ISPF application.