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When an alert is generated (by either SNA Transport or an HP e3000 operator),
it is stored in an MPE message file named nodename.PUB.SYS
(where nodename is the name of the configured SNA node the alert
is to be sent to).
SNA Transport continually checks the message files for alerts.
When it finds an alert in a message file, it sends the alert to
the remote system and waits for an acknowledgment that the remote
system received it. When it receives the acknowledgment, SNA Transport
purges the alert from the message file (but not before then). This
method ensures that all alerts are sent to the remote system. Note
that this method also might cause an alert to be sent to the remote
system twice. That could happen if an alert is sent but a link failure
occurs before the acknowledgment is received from the remote system.
Since the acknowledgment was not received, the alert was not purged
from the message file. So, when SNA Transport comes back up, it
will find the alert still in the message file, and send it again.
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