Last month, we talked about many of the details concerning the internal structure of the TSO Broadcast Dataset, which used to be known exclusively as SYS1.BRODCAST.
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TSO has been around, on OS/360 (circa late-1960s) and on later MVT and MVS systems, for many years. Being the "terminal access" mechanism for the Operating System, and being "User and Userid oriented", TSO (in MVS) has always had a messaging system, so that one user could send messages to another user.
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Everybody knows that it's often difficult to write an Assembler program of any complexity, and most of us know that it sometimes can be even harder to debug it. The same holds true if you're programming in other languages. Writing error-free code takes a lot of effort, and usually, you don't want to make that same effort twice.
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