Today I’d like to talk about a frequently neglected part of the MVS operating system, which need be neglected no more. This is the part of the system which IBM designed (many long years ago) to convey messages between programmers using TSO, and which is now mostly used to tell the programmer how well a job has executed. I’m referring to the broadcast facility of MVS. The broadcast facility uses a dataset called SYS1.BRODCAST. (The first A has been left out to get its name down to 8 characters.) SYS1.BRODCAST technically “belongs” to TSO, but it is a necessary part of MVS itself.
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