The EPC is designed to run on a proprietary Bell and Howell PC with both discs running. Getting it set up is a big problem.
The first screen up should be a picture of an SLK. In that screen the chassis number can be inserted or if you hit enter and chose "car" it will bring up a list of models which can be scrolled and clicked to enter. Very straight forward and both the sales designation (560SEL) and the identifying chassis number componenet (126.039) are listed.
Bosch Master, ASE Master, L1
33 years MB technician