Point him to the z/OS Window Service which is available for most HLL like 
Cobol, PL/1 and C/C++
Also with the z/OS R6 C/C+ Compiler there is native support for 64 bit and no 
longer need for data spaces.

Roland

-----Original Message-----
From: IBM Mainframe Discussion List 
[mailto:[EMAIL PROTECTED] On Behalf Of John Krew
Sent: Tuesday, October 11, 2005 11:42 PM
To: [email protected]
Subject: Data space addressability


Someone who is well versed in Unix and less so in the mainframe 
world has asked me a question which sounds preposterous on the 
face of it.  He asked if it would be at all feasible for a C 
program to establish addressabilty to memory contained in a data space.

Considering the need to manipulate access registers, and not 
seeing any way to reliably set an access register from a C 
program (or reliably pair it with a GPR containing the pointer),  I told
him "no".   Am I overlooking anything that anybody is aware of?

John Krew

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