It should be expected that the principles of operation not have any information about what data is placed there, as it is specifically defined to be set by a program to whatever that program wants it to be.
I'll bite: why would we want to document how the operating system sets this? It is not a programming interface. In what way would having this information help diagnosis (that being the only other reason I could think of)? Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
