anyone know if a intuos2 pen will work on a graphire3 tablet? The reason I'm asking is because my school is requiring us to supply our own intuos2 pen for our school lab but since I have a graphire3 at home, I wouldn't want a useless pen at the end of a semester. Or, how about a graphire3 pen on an intuos2 tablet? Are the added pressure sensitivities on the intuos2 on the pen or on the tablet itself?