Dasher

Dasher application was designed to be an information-efficient text-entry interface, driven by natural continuous pointing gestures. Dasher is a competitive text-entry system 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.
The eyetracking version of Dasher allows an experienced user to write text as fast as normal handwriting - 29 words per minute; using a mouse, experienced users can write at 39 words per minute.
Dasher is a zooming interface. You point where you want to go, and the display zooms in wherever you point. The world into which you are zooming is painted with letters, so that any point you zoom in on corresponds to a piece of text. The more you zoom in, the longer the piece of text you have written. You choose what you write by choosing where to zoom.