Opm
Is it really necessary???
Especially for the airports staff, the sytem is inflexible ( a break of 29 mins 59 secs leads to CRATCOH warnings), Old PC's (even at Heathrow, the jewel in NATS airport crown) which require faffing about to log on/off
I appreciate the fact that the area controllers wanted the system to monitor time worked on sectors / OJTI time, but the system is not ideal for the airports staff.