Is there a general consensus about what pieces or aspects of the software 
shipped with z/OS would be defined as the "operating system"?  

Thing is, I started thinking about what is an OS and I found myself having 
trouble defining it.  For example, for Unix it seems to me that the OS would be 
the Kernel plus any loadable kernel modules that come shipped with the OS, like 
drivers for I/O and so on.  It probably gets fuzzy when it comes to extensions 
to the OS.  Maybe an equivalent to z/OS would be the shipped SVC's as opposed 
to vendor supplied?

But for z/OS I wasn't how and where to draw the lines.  Especially since z/OS 
comes also with a UNIX kernel.

Any thoughts?  I was just curious about this.

Kind regards,
Lindy

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