1. A method for displaying three-dimensional workcell data comprising the steps of: providing from a data source 3-D workcell data representing a model of a machine and associated components in a workcell; providing a hand-held display device and placing the display device in data communication with the data source; communicating the workcell data from the data source to the display device; generating a 3-D visual representation of the workcell data on the display device; and operating the display device to manipulate the visual representation.