The Notice Sweeper is a process which causes asynchronous notice sends that have been in the Pending status for a certain amount of time to be marked as Failed. Essentially it is a process which times-out notices to ensure none ever get stuck in limbo if there was a problem sending them.
Currently only ISIS sends notices asynchronously, so Notice Sweeper will only sweep ISIS notices.
You can enable and disable Notice Sweeper using the Services tab of the System Options screen:
Note: This option is available for administrators only.
The Notice Sweeper EuroRunnerBO.NoticeSweeper component is part of the EuroRunner COM+ Application, and runs synchronously under the GMSL Service.
The Notice Sweeper is automatically set-up (with default values) as part of the server installation.
See the Notice Sweeper section of the Registry documentation.