For those of you with later cars that are supported on WIS, you may find this of some use if you get the DVDs:

You can first look up a part on EPC, using your VIN to make sure you get correct part, then without leaving EPC, click on the red hoist icon in upper right corner, and it will take you to WIS while remembering your VIN.

Not useful for 123s and other older cars, but found it helpful for my W210 (Which has been getting my full attention lately!)

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5