Key for operating both motor vehicle and building locks

摘要

A key operable with both motor vehicles and buildings includes a mechanically coded part and a transponder for exchanging an identification code that includes a fixed code and a second code part. The fixed code can be used within the framework of a door-locking system for the building for identifying the key user as the one authorized to enter the building. Both the fixed code and the second code part are used to operate a motor vehicle lock.