If you have RACF® installed, and your installation plans to use the RACF resource classes JESJOBS and/or JESSPOOL, a sample exit is supplied in SYS1.SAMPLIB that you may review. This sample exit allows the JESJOBS and/or JESSPOOL classes to control the jobname restrictions when these classes are active. If these classes are inactive, the jobname restrictions are controlled by the exit. The jobname restrictions for the TSO/E CANCEL command is the user ID plus one character. The jobname restrictions for the TSO/E OUTPUT command is the user ID. If you are using an installation-written exit, you may want to look at the exit in SYS1.SAMPLIB to determine if you need the same checking of the JESJOBS and JESSPOOL resource classes in your exit.