If I understand the flood of information that came my way when I was trying to 
understand this exact same thing, the LDA is an example of a control block you 
can access without using an SRB.

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of 
Ray Overby
Sent: 11. toukokuuta 2010 17:52
To: IBM-MAIN@bama.ua.edu
Subject: Re: Accessing Cross Memory Storage in REXX

My understanding is if the target address space is non-swappable then 
you can safely use non-srb code to obtain access to the other address 
space's private area. I believe the unpredictability comes when the 
target address spaces are swappable. Depending upon your application 
requirements non-srb code may in fact work. For example, address spaces 
with a system LX that support space switch pc routines will always be 
non-swappable. If your application required data from these address 
spaces you should be ok. There are other address spaces that normally 
run non-swappable. However, you could not access all address spaces with 
this technique. For swappable address spaces you should use SRB code. As 
usual, it depends upon your application.........

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