Improved search capabilities are disclosed for mobile communications devices such as cell phones, as well as improved techniques for delivering sponsored content in a mobile communication environment. The heat-activated glueable surface element has an electrically conductive layer in addition to a heat-activated adhesive mass. The processing structure further executes at least one application to facilitate user interaction with the touch surface. 9 is preferably satisfied where DS denotes the summation of the optimum designed groove height of the first diffractive element d1S and that of the second diffractive element d2S, and D denotes the summation of an actual groove height of the first diffractive element d1 and that of the second diffractive element d2. The invention further pertains to compounds produced by such cells, by transkaryotic animals in response to such cells, and to the uses of such compounds.