System and method for selecting an external user interface using spatial information

The method of claim 1 further comprising:

• downloading user interface logic data to the external processor;
• The method of claim 9 further comprising:
• obtaining a second grid information for a group of machines including the machine;
• and
• downloading user interface logic data to the external processor when the external processor enters the second grid.

A system for selecting an external processor as a user interface to a machine comprising:

• means for determining control grid position information for the machine;
• means for obtaining position information for the external processor;
• and
• processing means for using the control grid position information and the external processor position information in determining whether an external processor is in the control grid of a machine.

The system of claim 16 wherein the means for obtaining position information comprises an indoor electromagnetic wave positioning system

• The system of claim 16 wherein the means for obtaining position information comprises an ultrasonic positioning system
• A system for selecting an external processor as a user interface to a machine comprising:
• a processor;
• a control grid position map data base information for at least one machine connected to the processor;
• a position information receiver for obtaining position information data for an external processor;
• and
• a processor having processing instructions for using the control grid position map database and the external processor position information in determining whether an external processor is in the control grid of a machine.