The Eurocat2000 system which is used here (Australia) has the normal multi head processing and dual redundancy main computers etc. In addition each console has a PC driven system (Ultimate Fallback Display) that by passes the main Lans and provides very basicc SSR derived position and labelling with a small ammount of FDR information. It is available only on the secondary display units and is physically switched at the console by the controller. It is severely limited in use and capability and would be used only in a short term disaster recovery situation.