<snip> Is there code that has a zero base and non-zero index for something that might not be in common storage or in the primary AS? Wouldn't that cause problems in AR mode? </snip>
To the first question: aside from the cases that apply to secondary and home ASC modes, I would hope not. To the second question: yes. It is a very valuable technique for AR mode. Peter Relson z/OS Core Technology Design
