Hello, I want to use D-Bus to allow one "client" to get some information from a "service" object. But this service object could be implemented multiple times. I want to be able to just launch a new implementation of "service" in the pool without having to change the "client" implementation at all. Client should automatically use the the service with the highest priority. One example will maybe be better to explain it : Let say that I want to have the local temperature. Service 1 read the temperature from a real thermometer outside of the building. Service 2 read the temperature from a meteorological website I want program Service 1 to have a priority of 100. Service 2 is less precize so it has a priorityy of 10. client want to know the temperature : Usecase 1 : both services are running Client should automatically get the temperature from Service 1 Usecase 2 : Service 1 is down Client will still retrieve the temperature and, without knowing it, will retrieve it from Service 2. Usercase 3: A new super thermometer is implemented as Service 3 with priority 2000 (with service 1 and 2 still running) This service 3 will just have to be launched and register itself to the same session bus. Without any modification in Service1, 2 or client, client will automatically use Service 3 if available. Bonus Usecas 4: Service 1 adjust its priority automatically and decrease it if values are abnormal or if the hardware is down Client still use the highest priority so it fall back transparentely to service 2. Usecase 1,2 and 3 are mandatory for me. Usecase 4 is only an optionnal bonus so it's really not important. Is there a way to implement my usecase 1,2 and 3 with D-Bus with a few complexity as possible on the client side ? Currently, the only way I see is to have each service register on a bus "Service.Temperature.$SERVICE_NBR" and to export the same object with the same interface On the client side, you could do :     liste = bus.list_names()     for i in liste :         if i.startswith("Service.Temperature") :             get_priority(i)     use i with highest priority. But it seems an highly ineffective method which a lot of complexity for the client. So, how would you do that ? Thanks in advance for all the ideas, Lionel