Custom Bluetooth Stack?

[hypest]

I recently came across a 100% java Bluetooth stack that communicates with the BT chip simply via UART (http://www.javabluetooth.org/). Does anyone know if the BT chip in our HTCs (I personally own a Kaiser) is accessible as UART device? If yes, shouldn't it be possible to put together a custom stack (c++ or c#)?

any input is welcomed...