Hi! I think you are thinking about frequency range (?). Bluetooth is working within frequency range 2.402 - 2.408GHz. Using standard module and antenna you can send/receive data within range 10m. You can also connect an amplifier and increase the distance up to 100m. And about the Blutooth stack. I don't know this module well, I am currently gathering the informations, but I think the Blutooth stack chip has been built in. There are power, USB, serial RS232 and digital audio connections outside of the module. So the module is ready to connect and send or receive data. But how??? I'm still looking for. Thank you for your help. I will try to take a look at Linux code. And I have heard about some examples of Bluetooth data transmission implementations on Ericcson's CD which has been the part of Blutooth Starter Kit.

Jacek

PS
Life is brutal without having 10k$ ;)