A lead screw window operator utilizes a lead screw that is in tension whether the operator is being used to open or close a window assembly. The apparatus includes a supporting member and a connector supported by the supporting member. The vertical sections of the guides are mounted on the frames so as to be displaceable perpendicularly to the plane of the door leaf and fixed in the direction of movement of the door leaf. When a portable electronic device is coupled to the harness, the portable electronic device can be worn around a neck and communicate with an input andor output device operatively coupled to the data carrying cord.