Summary of control block field usage

This appendix serves as a reference for the experienced VTAM® application programmer by showing the following information for each executable macroinstruction discussed in this book:

The control block fields set by the application program when (or before) the macroinstruction is used.
The control block fields and registers set by VTAM upon completion of the processing started by the macroinstruction.

Note: All of the control block fields that apply to each macroinstruction are shown, but remember that not all fields apply to every possible variation of a macroinstruction. See Conventions and descriptions of VTAM macroinstructions, for details about each macroinstruction.

For declarative macroinstructions, the macroinstruction operands and defaults are shown.

Throughout this appendix, a pointer (→) indicates that a field contains the address of the given item, and an equal sign (=) indicates that a field contains the item itself.

Mutually exclusive fields are indicated as such when they occur in a macroinstruction. For example, NIB and ARG are mutually exclusive in the CLSDST macroinstruction; only one of the two can be used.

Indented fields are associated with the field preceding them. For example, the NAME, CID, USERFLD, LOGMODE, and LISTEND fields are all associated with the NIB field.

Fields that provide information supplied by your program rather than information provided by the macroinstruction are indicated by bold type. All information preceding the bold type concerns information that your application program supplies to the macroinstruction. All information shown in bold type is information that the macroinstruction passes back to your application program.