As far as I know, bluetooth devices are transceivers, as in they can do both. Make sure you read up on the whole bluetooth protocol, before you buy.
They usually also have in them a unique ID code to distinguish them one from another (Bluetooth MAC-adress). Which is probably retrievable from some kind of internal data register.
thanx for your anwser it sounds very logic what you say with the mac adress.Do i need a seperate bleutooth program for installing it?
I don’t know. It would depend on the rest of your design (do you intend to use micro controllers?), and what particular bluetooth device you want to use. Actually, I’m not sure I understand what you mean with bluetooth program?