What do I need?

[clcollins]

Being an absolute novice where VAG-COM is concerned, what package do I need (apart from the laptop) to run VAG-COM?

My car is a 2002 A3 1.9 TDI Sport Quattro.

All advice appreciated.

[ImolaS4]

You need the software and the cable to attach the laptop to the car's OBD com port.
Go here:
http://www.ross-tech.com/