Question on BlueTooth HCI

Hi all,

here, i hope i post in right position.


now, i would like to know more about BlueTooth 's HCI

1> can i say, is it programmble ?
is it somethigns similiar to Assemble code for example, say 8051 ?

2> if it ia able to program, will it ususally burn into ROM ?

3> if it is programable, use what software to write ? complie ? is it convenience to send program to bluetooth module ?

4> is there any good HCI document or information ? i hurry to know more about it....

super Thanks