vertically extending sensing electrodes 110 and horizontally extending sensing electrodes 112 separately the first microcontroller is one form of electrical circuit that may be used to interrogate the sensing electrodes 110 112 however alternatively other types of electrical circuits may be used for this purpose the individual sensing electrodes 110 112 can be interrogated by applying a signal to measure the capacitance the capacitance of electrodes proximate a user 39 s touch will change thereby revealing the location of the user 39 s touch the vertically extending sensing electrodes 110 can determine the x coordinate s of a user 39 s touch or multiple contemporaneous touches and the horizontally extending electrodes 112 can determine the y coordinate s of the user 39 s touch or multiple contemporaneous touches note that for two contemporaneous touches e g with a thumb and forefinger there are two x coordinates and two y coordinates and the system 100 can not necessarily properly pair the x and y coordinates together there are four possible pairings only two of which are valid note however that the system also includes the lower rectangular section 106 and that the sections 104 106 are sized in view of the.