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A general note about user-written programs
The following comment applies to all user-written programs mentioned in Part
8 of this book:
v Upon return from any customer-written program, CICS must always receive
control in primary-space translation mode, with the original contents of all
access registers restored, and with all general purpose registers restored
(except for those which provide return codes or linkage information).
For information about translation modes, refer to the
IBM ESA/370
Principles of Operation
manual.
740 CICS TS for OS/390: CICS Customization Guide