Patent ID: 8806039

Claim:
A method for selecting an external processor as a user interface to a machine comprising: accessing control grid position information for the machine, wherein the control grid position information provides a control grid of the machine comprising a subset of an effective positioning space covered by a positioning system; obtaining position information for the external processor using the positioning system; and using the control grid position information and the external processor position information to determine if the external processor is in the control grid of the machine, and only if the external processor is located in the control grid of the machine, providing user interface control of the machine to the external processor, wherein, the user interface control of the machine is provided to the external processor to the exclusion of the internal user interface of the machine; and obtaining position information for a second external processor; and determining whether to give priority of control to the external processor or the second external processor based upon the position of each of the external processor and the second external processor.