Hi for all

I've bought a simple bluetooth external device(like Asus WL-BTD201 Bluetooth dongle).
I want to create a single program to read it but I haven't any idea what I need to do. Is there a free library that I can use?
I've read something like bluetooth have a stack(???). Things like WIDCOMM stack.
Honestly I have any idea how can I do this. Someone can help.


Thanks for support.