The plan was for NERC to have its own 'FDP' server and each workstation sub-versions. But all the Flight Data comes down the NAS link from LATCC's Host Computer System.
HCS was supposed to be upgraded to 4381s for Y2K purposes to replace the 9020D. Not sure whether NATS ever did this upgrade but it still runs on '9020 software' in effect.
NERC's rather more than a Display System Replacement and utilises a fair bit of the failed Advanced Automation System software I believe.
Once upon a time I saw pix of the new FAA workstations post-AAS pre-DSR which appeared to show great big (paper) stripboards plonked over the Planner's (NERC parlance) screens. No doubt the NERC doubters are looking forward to seeing the same at an ATCC near you shortly! True or false Scott?