<snip>
assuming we are careful to return R15=0 in our exit routines and not 
change
anything in the passed parameters, could that still affect or override in
any way the results of the default or system exit routines already in
effect for those exit points? 
</snip>

No, it could not.

<snip>
(Now why certain IBM components
continue not to use it is another matter.)
</snip>

Because, presumably, there has been not enough call to do so (and there 
is, of course, a cost for implementation). If you have a reason for 
wanting/needing a particular exit to exploit the dynamic exits facility, 
then please submit an RFE. When the facility was developed, we took a stab 
at which existing exits that we thought were most likely to be of help to 
the most customers. And I'd hope that new exits use it.

<snip>
SYS.IEFUSI AND SYS.IEFACTRT 
</snip>

I agree with Tony H's point that you need to consider whether you might 
also need the other cases such as SYSSTC.


Peter Relson
z/OS Core Technology Design


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