SYSOUT

In OS/360, System Output datasets are spooled direct-access storage device data sets managed by the operating system. They are despooled by system output writers, which typically write to printers and card punches, although they can also write to magnetic tape. The support in OS/VS2 R1 is essentially the same. The programs Attached Support Processor and Houston Automatic Spooling Priority usurp the spooling functions of OS/360 and SVS, maintaining SYSOUT datasets with their own SPOOL mechanisms.
In OS/VS1, SYSOUT datasets are managed by Job Entry Subsystem 1, retaining many of the same operator commands but replacing the SPOOL mechanism.
In MVS, OS/VS2 R2 and later, SYSOUT datasets are managed by a Job Entry Subsystem, retaining many of the HASP or ASP operator commands and providing their own SPOOL mechanisms.
DOS does not support spooling, but several spooling programs are available for it, e.g., Grasp, POWER.