If you are looking for the quick answer, here it is:

J2534 is horizontal integration. You buy a generic tool (like a Mongoose or a Tactrix OpenPort) and it works with software from any manufacturer—provided that manufacturer supports the J2534 standard.

: Run the installer for the VCDS software version provided with your interface or from Ross-Tech .

For nearly two decades, (Vag-Com Diagnostic System) from Ross-Tech has been the undisputed gold standard for diagnosing, coding, and programming vehicles from the Volkswagen Auto Group (VAG)—including Audi, Bentley, Lamborghini, Seat, and Skoda. It offers dealer-level functionality without the dealer price tag.