Patent ID: 7158123

Claim:
A touch sensitive user interface system including: a display screen ( 20 ) for displaying a plurality of primary and secondary images ( 86 , 92 ) representative of primary and secondary selectable options; touch sensitive means ( 56 ) for detecting the concurrent presence of at least one of a first probe ( 84 ) and a second probe ( 88 ) in contact with the display screen ( 20 ); and, control logic ( 38 ), responsive to the touch sensitive means ( 56 ), for determining the first probe contact position, defining for each primary image representative of a primary selectable option, a first probe contact area of predetermined size, over which contact with the first probe selects the primary option, displaying a secondary menu ( 90 ) including a plurality of secondary images representative of secondary selectable options, and defining for each secondary image representative of a secondary selectable option, a second contact area of predetermined size, over which contact with the second probe selects the secondary option.