The present invention includes an enclosure with a floor that include an upper side and a lower side opposing the upper side. The lower side contacts a surface and is reversibly attachable to the surface. The enclosure also includes a sidewall attached to the floor.
A light pen for use in data imput to data processing equipment, has an adjustable tip assembly wherein the tip switch sensitivity and tactile feel or feedback to the user can be varied according to user preferences and particular applications. In one mode, the pen can be set for a normal