Diagnostic Information - OBD-II

[Felix Homburg]

I would like to know a little bit more about OBD-II. I'm from Europe and for the 
cars in Europe it's not law to have OBD-II. Do all the new cars in the U.S. have 
a compatible connector for OBD-II. Does anyone have the pinout and the outlines 
of this connector?
Are the scan-tools for OBD-II for all cars the same or does a garage use 
different scan-tools for different cars?
I'm working on diagnostic system for VW/Audi and I'd like to include the OBD-II 
protocol so it would be interesting for me to get a little bit more knowledge 
about that.

Thanks

Felix