16. A system of one or more computers configured to perform operations comprising: one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for: detecting a contact with a touch input device of an electronic device, wherein the touch input device is configured to receive touch input from one or more fingers and determine an electrical resistance associated with each of the one or more fingers providing the touch input; identifying at least one finger of the one or more fingers associated with the detected contact based on the determined electrical resistance, wherein each finger is identified based on a characteristic electric resistance corresponding to the respective finger as determined by the touch input device; determining a finger-specific command associated with the contact from the at least one identified finger, wherein the finger-specific command is determined based at least in part on each finger identified based on the characteristic electric resistance; and performing the determined finger-specific command.
16. A system of one or more computers configured to perform operations comprising: one or more processors; memory; and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the programs including instructions for: detecting a contact with a touch input device of an electronic device, wherein the touch input device is configured to receive touch input from one or more fingers and determine an electrical resistance associated with each of the one or more fingers providing the touch input; identifying at least one finger of the one or more fingers associated with the detected contact based on the determined electrical resistance, wherein each finger is identified based on a characteristic electric resistance corresponding to the respective finger as determined by the touch input device; determining a finger-specific command associated with the contact from the at least one identified finger, wherein the finger-specific command is determined based at least in part on each finger identified based on the characteristic electric resistance; and performing the determined finger-specific command. 19. The system of claim 16 , wherein prior to receiving the contact, receiving an indication of contact mode from a selector, the selector being associated with and triggering preparation for receipt of the finger-specific command.