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Events occur in a network or within your system, which do not result directly from any operator action you have taken, yet need to be reported. The various kinds of messages resulting from these events are termed unsolicited messages.
VTAM generates messages for events taking place within the network, called Primary Program Operator (PPO) messages. VTAM can route these messages to the system console (to notify the system operator), and to any suitably authorized programs.
When your system receives any PPO messages from VTAM, it filters out messages, by message number, through the DEFMSG table, and passes them to PPOPROC, if active. It then checks to see if any OCS operators logged on have the authority to receive such messages.
By default, a PPO message for a particular resource is sent out to ALL operators authorized to receive it. If a message cannot be delivered to any operator, it is sent to the system console.
A PPO message which does not concern a particular resource and cannot be delivered to an appropriate operator is tagged as undeliverable. These messages are sent to all operators that are profiled to receive undeliverable messages. These messages are prefixed by U when displayed on your terminal. If there are no such operators, it is sent to the system console.
If you are authorized to receive VTAM PPO messages, they appear in your OCS window. All VTAM messages are displayed in high-intensity, and are time-stamped. Your terminal alarm sounds to notify you whenever an unsolicited event has been reported.
In addition, your VTAM message access can be prescribed for receiving only those messages above a given severity level.
Some VTAM messages sent to you through the PPO interface require a reply. These messages are delivered to appropriate operators in the same way as standard non-reply PPO messages.
PPO messages that require a reply are delivered as non-roll delete messages that remain on your screen unchanged, until answered. Replying to a VTAM message automatically changes the NRD status of the message and places it on the roll delete area list.
To reply to these messages, use the REPLY command.
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