Occurs when an external event is received from a GPS extension.
Use this event to write code that performs any desired action when an external event is received from a GPS extension. GPS extension developers can cause ArcPad to trigger this event by setting the EventMask in the INSTRUMENT structure. The extension can set up to 32 flags (enumerated 0-31) by setting any of the bits in the EventMask in the INSTRUMENT structure. OnExEvent will be triggered for each bit set and The ID property of the ThisEvent object will contain the associated value (0-31).