mouse following bone

Hi all in the mighty blender forum!
I have had success in making an object follow a mouse …object looks in the direction of the mouse cursor.
I was wondering,…in the GE, is it possible to make an idividual bone do a similar thing…for example…if I had an armature in a character… one bone in the head, one in the body. Could I rig it up so the head bone follows the mouse?
If so, how could it be done?
Any hints, tips or tutorials would be greatly appreciated.