IRXINITX

Use this exit to prevent language processor environments from being initialized. For example, if you want to prevent more than n number of environments from being initialized, use IRXINITX. When the number reaches n, IRXINITX can return a non-zero return code to prevent the initialization.
You can also use IRXINITX to alter the parameters used for initializing a language processor environment. For example, if you want to prevent REXX execs from using the STORAGE function, use IRXINITX to set a flag to indicate that the STORAGE function is not allowed under the language processor environment.