Use Exit 40 to change the characteristics of a SYSOUT data set before JES2 gathers the attributes of the data set into an output group ($JOE). For example, you can change class, routing, or forms attributes of the data set. You can also affect the grouping of the PDDBs, or delete the data set by setting the PDB1NSOT bit in PDBFLAG1. Any logical attributes of the data can be changed with this exit. You can also use Exit 40 to influence the issuance of the $HASP549 notify messages.