Basically it's a virtual computer which you can run in a window with the software provided.
On that computer there is ODIS, Audi's equivalent to VCDS with, "Guided fault finding", so when a fault is found, it'll advise of the probable fixes, and how to do them, though the on-line services access is unavailable without an Audi login, but still very useful without.
Then, the Elsa software is basically a Haynes manual for all Audi's, and it's what their "technicians" use, words & pictures.
Albert
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2011 A8 Executive 3.0 TDI Quattro
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