Statuses
From FreeDESK
Requests are assigned statuses and these can be configured through the system administration menu.
Once a status has been created requests can be set (either on creation or update) to this status which is displayed within the system interface. This allows distinguishing between requests which are awaiting action by a third party or similar.
Once a request is complete it's status can be set to Closed (this is a system-made setting which cannot be deleted unlike other types) and it will no longer be visible in the normal request lists.