Don't waste your time, the information about KW71 is almost impossible to find. This doesn't means nobody knows about it, the problem is the people who knows don't share it, so there is two chances, Carsoft at $2.500 or the Russian one at $ 150 (euros). The only lack this software has is that it doesn't read AirBag faults.
I built the hardware (ISO 9141 interface) and cost me no more than $ 3.00
There is only one powerful reason for me not to buy it, my car (328i) uses a different communications protocol named DS2 (Murphy's law)
For guys having 1987 to 1995 cars this is a jewel.
Hope this help.
BTW Manuel, I sopped my software work because I'm selling my 328i, I'll try to get an e36 M3.
Bye
GUS