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nice assortment of alternative and typical trackballs at discounted prices.

"Click-N-Type is an on-screen virtual keyboard designed to provide computer accessibility to anyone with a disability that prevents him or her from typing on a physical computer keyboard. As long as the physically challenged person can control a mouse, trackball, touch screen or other pointing device, this adaptive software keyboard allows you to send keystrokes to virtually any Windows application or DOS application that can run within a window. "

"The Dynamic Keyboard is an on-screen keyboard which allows you to type using your computer and an input device such as a joystick, trackball, mouse, single switch, among others."