In a JES2 system, if you do not specify a class on this DD statement or a referenced OUTPUT JCL statement, JES2 assigns the sysout data set to the output class defined by the MSGCLASS value of the JOB statement. See the override order shown under "Purpose" for how this default is established.

If you do not code a writer-name subparameter on this DD statement or a referenced OUTPUT JCL statement, the installation’s job entry subsystem processes the sysout data set.

If you do not code a form-name subparameter on this DD statement or a referenced OUTPUT JCL statement, JES uses an installation default specified at initialization.