The line defines the the maximum number of messages between scans that will be redirected to the NWall processor before NWall Processor reset is attempted.
The reset is equivalent to terminating the NWall Job Processor (NWalljp.exe) that is backlogged and then restarting it.
The value of the Notes statistic Antigen.NWall.Backlog maintains the current number of messages between scans.
Each time the NWall processor successfully scans a document, the Backlog is reset to zero. The principle use of this setting is to prevent messages from being queued into SCAN*.BOX indefinitely if the NWall Processor has exited or stopped responding.
Use a value of zero to cause NWall to never to reset.
Example : NWallResetScanQ=480