| Value | Description |
|---|---|
| M | If no worker task is available, LISTENER returns message TAU0171E to the client. It does not wait for a worker task to become available. |
| W | If no worker task is available, LISTENER waits until one becomes available. |
| WM | If no worker task is available, LISTENER waits until one becomes available. Additionally, message TAU0009E is written to the hardcopy log. |