Dasher is an information-efficient, text-entry interface, driven by a natural continuous steering of the cursor into boxes representing the letter you want to input. Dasher is especially useful for text-entry wherever a full-size keyboard cannot be used — for example, * when operating a computer one-handed, by joystick, touchscreen, trackball, or mouse; * when operating a computer with zero hands (i.e., by head-mouse or by eyetracker); * on a palmtop computer; * on a wearable computer.