>Ergo, an OS is . . .
><snip>
>...what z/OS do?

Or:
Do that voodoo you do so well!

The definition is never going to be nailed down properly.

If you define the OS as just BCP, then you are going to have a lot of things 
that you cannot do.
So, if you expand the definition to BCP, JES2, all the utilities and tools 
needed to keep it runnning, you can expand it to VTAM, TCP/IP, TSO, ISPF, SMP, 
and keep going.

There are (many) valid cases for including/excluding certain sub-systems.
But, I would go  with all the ('free') stuff that is bundled inside z/OS, and 
covered by that single licence, as a start.

When in doubt.
PANIC!!    

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