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JWATCH is a TACL routine that runs in the background, continually monitoring processes. It's primary use is to ensure that a system's critical processes stay up and running and provide notification when there is a problem.

When JWATCH detects that a monitored process is not running, has stopped, or abended, action is taken via a user supplied TACL routine. The routine can be as simple or complex as required, but typically will contain just a few lines to either output a warning message to a console, restart the process, or both. Individual processes can be added, deleted, temporarily disabled or enabled for monitor, on the fly.

The JWATCH monitor runs as a non-stop process pair.