> On 1 Feb 2017, at 2:20 am, Paul Gilmartin 
> <[email protected]> wrote:
> 
> Why?
> 

Probably because R0 points to the REXX environment block which is used to 
signify its a REXX environment in use. 

> This is bizarre.  And sometimes hard to satisfy.  BPXWDYN ought to provide an
> alternate entry point free of the requirement so users don't to need to write
> wrappers to clear R0 and CALL BPXWDYN.

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