These functions allow a user to modify or obtain SWBTU data associated with a SYSOUT dataset. SWBTU data consists of dynamic output values such as ADDRESS, CLASS, COPIES, FORMS, NOTIFY, etc. The output values (‘keys’) that can be modified by SSI 70 are listed in the IEFDOKEY macro. See the z/OS® MVS™ Data Areas book for a description of the IEFDOKEY data area.