A pointing device includes a single control element to provide a user with
absolute coordinate information and to enable user control of a computer
cursor and emulation of mouse clicks. User movement of the single control
element in an (x-y) plane preferably moves an optically reflective
surface relative to an optical sensor system stationary within the device
housing, such movement precluding rotation relative to the (x-y) plane.
Mouse clicking may be emulated by moving the single control element up or
down and/or by tilting relative to the (x-y) plane. Alternatively mouse
clicking may be emulated by user activation of left and right sensor type
switches or sensors. The device may be used by handicapped persons who
can control cursor movement and mouse clicking using the single control
element.