Bigdaddybenz-
The simplest and quickest way to get familiar with all of the nomenclature and CAN diagrams is to purchase a subscription at ALLDATA.com for your car. You get a year's worth of access to their data base for about 25 dollars.
You'll find "Operation and Description" sections for most of the systems and subsystems for your car. The diagrams use the MB abbreviations you want and will tell you that N22 is the climate control head in the dash.
If you look up Powertrain Management, I think you'll find a complete description of how your key/alarm/immobilizer work...
You can also buy into the MB on line database (expensive if you just want to browse) or find a WIS manual.
You'll be amazed how much "stuff" talks to each other. You'll also be surprised where some of it is located in the car.
Hope this helps.

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KenP

1996 S500 W140 Coupe