If you currently have TSO or TSO/E, you probably already have the required customization discussed in this topic. However, when you upgrade to a new release of TSO/E, IBM® suggests that you ensure that the user definition data sets that you are now using are correctly formatted. The data sets are the user attributes data set (UADS) and the broadcast data set. If you have RACF® installed, you can define your TSO/E user information in the RACF data base. For more information, see Maintaining the UADS, RACF data base, and broadcast data set. You must ensure that the UADS , the RACF data base, or both and the broadcast data set are synchronized.

Even if you don't currently have TSO/E, the UADS and broadcast data sets may already be cataloged on your system. MVS™ requires that they be cataloged unless you have customized MVS to eliminate the requirement.