New name is Vag Com Diagnostic System (VCDS). VAG is Volkswagen Auto Group. Com is communications.
VCDS is a dealer level diagnostic program designed exclusively for VW Audi and (in the rest of the world) all other brands owned by VW (SEAT, Skoda, Bentley, etc.). It has many additional capabilities such as logging and graphing performance data, reading, interpreting, and clearing fault codes. It is the best diagnostic tool available for Vag products. Even VW's own tech support people use it because it does more than VW's own $8000 scan tool plus it is easier to use.
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Don