An Area (also called domain here) is a closed numbered sub network concealed within an open numbered network with several virtual nodes. You reach an Area with a common code number, the Area code.. These must be set up in every node in the Area (with AMO WABE) with DAR OWNNODE .From "the outside" the Area looks like a single node which is reached with the Area Code. Also a (physical node number) PNNO must be assigned to every node in the Area. For the feature "Route Optimization" you must in addition establish a physical node code number (PNODECD) which must be unique within the complete Area. The Area code number is entered as the open numbering node code number in AMO KNMAT for modification of station numbers.