This is primarily a performance enhancement option that removes the overhead of NShield scanning from tasks that pose no security risk. For example, the indexer tasks UPDATE and UPDALL pose no security risk and can be trusted. Note that tasks specified must have the platform prefix included if the task is a server add-in task.
Another use for this setting is to resolve conflicts between NShield and other third party Notes software.
Although this may never be necessary, its nice to have the option.
Example (Windows NT): AntigenTrustedTasks=nupdate