A multi-touch system is disclosed that recognizes simultaneous touchdown of four fingers on, above, or below the home row of keys as a modifier chord and applies modifiers such as Shift, Ctrl, or Alt to subsequent touch activity until none of the chord fingertips remain touching. Touches by the thumb...http://www.google.fr/patents/USRE40153?utm_source=gb-gplus-shareBrevet USRE40153 - Multi-touch system and method for emulating modifier keys via fingertip chords
Multi-touch system and method for emulating modifier keys via fingertip chords