Coordinate input device convertible between right-handed and left-handed modes

A coordinate input device (e.g. mouse-like device or cursor-like device) includes an outer housing which is movable between a first position adapted for use by right-handed users, and a second position adapted for use by left-handed users. In such a manner, the coordinate input device is easily utilized by both right and left-handed users. In certain embodiments, a rotatable thumb or finger wheel may be provided in the coordinate input device for manipulation by the user in order to adjust a parameter of an image being written/drawn on a corresponding display screen by the coordinate input device.