Position information is entered using a pen-like stylus. The distance this pen is from the tablet is important. If the pen tip is within one half inch of the tablet surface, the cursor location on the screen corresponds to the X,Y location of the pen on the tablet. This condition is called the ``near'' position. If the pen is more than one half inch from the tablet surface, the cursor remains located in the center of the screen. When the pen is pressed against the tablet surface, the pressure switch is activated and a ``mouse'' event is sent to MGED.