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If it's desirable to not display a certain group to any user of the GUI we may invoke the 'Hide Groups' feature. This is available from the NMIS9 top menu bar by selecting System->System Configuration->Hide Groups.
Note: You can select group visibility on a per user basis using the Users table's group field (Users.nmis file) as in previous versions.
The members member nodes of a hidden group will still be collected on, but they will not be visible via the GUI to any user.