Fig. 10From: Design and implement chords and personal windows for multi-user collaboration on a large multi-touch vertical display a Two users are applying chord modifiers. The left one has touched three fingers and thus selected blue colour while the right one has touched four fingers and thus selected yellow colour. b When users “touch-up” the screen a window pops-up allowing the drawing of blue lines for the left user and the drawing of yellow lines for the right user Back to article page