Abstract: A system for handling variable digital information comprising a key having an active integrated circuit component with leads extending therefrom, a battery for powering the component, unplated leads extending from the component to both the battery and to one edge of the key, and a container for sealing the component, battery and leads except at the edge of the container; and a receptacle having a plurality of unplated leads couplable at their inboard ends to electronic machinery and couplable at their outboard ends to the leads at the edge of the container.