> Maybe the program was converted from VSE which, in the days when it was
DOS anyhow, used an SVC macro to "end the job".

So, effectively, does z/OS.  ISTR that R14 in a jobstep programme points
directly at an SVC 3 instruction.   You used to be able to tell if you were
the jobstep programme by looking at that.

-- 
  Phil Payne
  http://www.isham-research.co.uk
  +44 7833 654 800

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