1. A method for controlling a parameter related to a position of a computer display cursor based on a point-of-aim of a pointing device within an interaction region, comprising: projecting an image of a computer display to create the interaction region; establishing at least one calibration point having a predetermined relation to said interaction region; directing a pointing line to substantially pass through said calibration point while measuring a position of and an orientation of the pointing device, said pointing line having a predetermined relationship to said pointing device; and controlling the parameter related to the position of the cursor within the interaction region using measurements of the position of and the orientation of the pointing device.