Thank you Roger for the instant reply,
I read the links you sent me and I have achieved the Bluetooth Connection, as it is in the samples (to send an integer from the PC and print its negative on NXT's screen). Unfortunately, I haven't yet achieved the remote control despite all my efforts.
For the remote control part I have found this: http://lejos.sourceforge.net/p_technologies/nxt/nxj/api/lejos/devices/KeyEvent.html
Could you please tell me if this is useful and give me an example of how to use the commands? (For example, when you press the up arrow key we want the robot to go straight)