Sorry I misunderstood 
So if Address Space A would like to post Address B the ECB must be addressable 
to to B as that is the Target the ASCB is that of the target Address space B 
the ECB can be B private area in A all I need is the address of the ECB even in 
private and ASCB of B

Thanks 


On Sep 26, 2018, at 7:41 AM, Peter Relson <[email protected]> wrote:

>> This is just another way of saying that for XMEM the ECB is in CSA right 
> ? 
> No, not right.
> 
> What within the wording "must be addressable from the address space 
> identified by the ASCB parameter" makes you say that? Storage addressable 
> from an address space includes common storage (whether CSA or SQA) and 
> private storage of the address space. The ECB can be in any of those 
> areas. 
> 
> Peter Relson
> z/OS Core Technology Design
> 
> 
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