People with a mobility impairment use trackballs as an assistive technology input device. X is an architecture-independent system for remote graphical user interfaces and input device capabilities. The interpreter continues to read space-delimited words from the user input device. Users can control Nest without a touch screen or other input device. Control devices can also combine the functionality of an application controller and an input device. Hence, it can be used as an input device. A user chooses an option from a menu by using an input device. Paper tape was used as early as 1857 as an input device for telegraph. OMR is now used as an input device for data entry. Other token types do the synchronization when the token is inserted into an input device. Olympus showed a prototype finger-set input device. They are typically the main input device for video game consoles. A keyboard with trackball is the input device for operation of this system. As an example, consider an input device connected to 8255 at port A. Tracking the user's hand(s) or a handheld input device can provide a 6DOF interaction technique.