The print service indicates that a - possibly transient - problem may
require external intervention before the print service can continue. One
example of an event that can generate this message is when the printer
runs out of paper.
Not all print services may be capable of delivering interesting events,
or even telling when a job is complete. This message indicates the print
job has no further information or communication with the print service.
This message should always be delivered if a terminal event
(completed/failed/canceled) is not delivered. For example, if messages
such as JOB_COMPLETE have NOT been received before receiving this
message, the only inference that should be drawn is that the print
service does not support delivering such an event.
The job is not necessarily printed yet, but the data has been transferred
successfully from the client to the print service. The client may free
data resources.