A method is described for establishing a focus traversal protocol in a graphical user interface having a plurality of components within at least one top-level window. An elongated central slot is defined in the card-receiving face generally along a longitudinal axis of the housing for receiving a card edge therein. The cell selector and processor includes a search circuit for detecting a cell from the received signal, a cell operator for determining a cell from which received is a signal associated with a shorter propagation path, based on the reception timing of the received signal, and a connecting cell selector for selecting a cell to be connected.