Location in the JCL

Place JES3 command statements before the first JOB statement in the input stream, if you are also submitting jobs. JES3 treats any JES3 command statements that follow the JOB statement as comment statements.
You may enter several command statements at one time.
You may enter command statements through card, tape, or disk readers.
You may place command statements as the first statements in an active card reader that you are restarting.
You may not enter command statements through an internal reader (by issuing a TSO/E Submit command) or from another node.