Design overview

The DFHSUWT module provides the following support for executing MVS™ WTO and WTOR SVCs:

SEND
supports Write To Operator (WTO):
CONVERSE
supports Write To Operator With Reply (WTOR):

The DFHWTO macro may be used to send a message, normally to the system operator, when neither the CICS® message domain nor the old message program (DFHMGP) can be used. The message domain cannot be used during certain phases of initialization and XRF processing, because it requires a kernel stack environment. DFHMGP cannot be used during initialization, nor during any sort of abend or dump processing, because it uses task LIFO storage and may therefore invoke the storage control program.

The DFHWTO macro may also be used to terminate CICS abnormally or to request a reply from the operator.

Any WTO or WTOR macros that are issued by CICS might be intercepted by the console message handling facility described under Console message handling. This service optionally inserts the CICS region’s applid into CICS messages before they are displayed on the console.

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