Patent ID: 7173603

Claim:
An input system comprising: a first input device for specifying a position on a display screen, which is connected to a computer for executing an application program and for displaying a processing object area of the application program on the display screen, said first input device configured for being controlled by a user's dominant hand; a second input device differing from said first input device, said second input device configured for being controlled by a user's non-dominant hand, said first and second input devices simultaneously operable; an instruction set for instructing a change in a display state of the processing object area on the display screen while the application program is being executed by said first input device, in response to an operation of said second input device, wherein said instruction set instructs a change of a display size of an object contained within the processing object area displayed on the display screen in response to an operation of said second input device; wherein said instruction set includes an emulator generating an instruction signal compatible with the application program executed by the computer, and wherein the instruction signal is responsive to an operation of said second input device.