Paddy,
they type yer chassis no. in to the pc.....
it hiccups a few times and, based on the no., it knows when the car was assembled, what sofware code it uses etc..
often a problem or anoyance will arise that it is easier to reprogram the ecu than risk negative customer feedback..
so, as you get the chance.. program it..
thats all she wrote dood..
Joe.. yer pal . !