Owen,
Who mentioned monitored approaches, not me.
An automated program that monitors an aircrafts 3 dimensional position reference, say a GPWS data base, absolutley no input required from the controller unless the aircraft breaks the protected area outside say 5nm of the destination aerodrome and the alarm sounds.
I say again, not monitored approaches, simply a computer program checking an IFR aircrafts position against protected areas ( LSALT, Grid, MAS, MVA, Approaches) similar function to GPWS, but ground/RADAR based (mode A & C and/or ADSB-B).