An apparatus method of estimating a channel in a wireless communication system are provided. In an embodiment, the article includes a substrate with at least a portion formed of a porous first material into which an active ingredient is impregnated, and a protective layer of a second material extends over a surface area of said portion to reduce degradation of the active agent. Data is continuously updated and cleansed by the showcase inter-agent. In a further embodiment a second set of icons are generated for those options in the first display which can be selected and the icons in the second set are each positioned with respect to an available icon in the display and indicate the action required by the user to select the said option.