Ross-Tech : You will find a diagnostic software (VAG_COM) to discover the OBDII protocol.

OpenDiag :Open diagnostic project where everyone can find or add its contribution to free communication tools.

Jeff : Here are useful data on PC<=> ECU link (Personal computer <=> Car computer).

VW info page : VW / AUDI protocol explanations.

Forum Opendiag : This group was my main source of informations.

Forum Vag-Com : This group deals with Uwe Ross tool (VAG_COM)