Register contents when Exit 23 passes control back to JES2

Upon return from this exit, the register contents must be:

A return code of:

0: Tells JES2, if additional exit routines are associated with this exit, to call the next consecutive exit routine. If no additional exit routines are associated with this exit a zero return code tells the FSA to produce any separator that has been defined by the installation based on the information contained in the JSPA.
4: Tells JES2 to ignore any additional exit routines associated with this exit. However, all other processing noted for return code 0 is accomplished.
8: Tells JES2 to unconditionally suppress production of the job separator page. The JESNEWS data set is not assigned.
12: Tells JES2 to unconditionally (that is, even if the printer has been set to S=N) produce any job separator page.