How Messages Are Routed

The destination of a particular message and the method used to send it depend upon the environment from which the message was issued.

Messages originating in the product main address space are issued using the WTO (Write-To-Operator) macro instruction. These messages are routed to system consoles and to the system log. They also appear in the OPSLOG Browse component of OPSVIEW. The specific consoles upon which a WTO generated message appears depends upon routing codes. These are described for the WTO macro in the IBM manual z/OS V1R8.0 MVS Assembler Services Reference IAR-XCT, SA22-7607-11.
Messages issued from the TSO-based components (such as the TSO command processor, OPSCMD) are produced using the PUTLINE macro. The destination of PUTLINE output is dependent on context:
- Interactive TMP output is routed to a TSO terminal.
- Messages issued from within a server address space are re-sent using the WTO macro instruction.
- Batch TMP output is routed to the SYSTSPRT ddname.