Okay, that's cool, last question then:
Can i use arduino + zigbee + bluetooth shield all together?
I'd like bluetooth for amarino (interface with mobile android phone)
and i'd like a zigbee to communicate to other end devices (without bluetooth shield).
So in short, a mobile phone could control a simple 2- or more zigbee node network 
This is why i'd like to dinamically change the 'master' zigbee's config from multipoint (setup to other zigbee end devices)
to point-to-point ('master' zigbee becomes a node temporarily)