Graphic tablet coordinates

Hello all,

I am using Win XP, MATLAB 6.5 and PTB 2.54.

I would like to know how to get the coordinates of the stylus while on the graphic tablet
(Wacom Intuos2) attached to the computer. I know that using GetMouse will get the
coordinates of the cursor on the screen, that's not what I need. I just need the position of
the stylus on the tablet.

thank you very much

Pat