http://www.inference.phy.cam.ac.uk/dasher/DasherSummary.html
<q>
Dasher is 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,
on a palmtop computer;
on a wearable computer;
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).</q>
Warm regards
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