A method for transferring encrypted useful data objects to a first telecommunication terminal wherein at least one encrypted useful data object is initially transferred from a switching component to the first telecommunication terminal. The attachment extrusion includes an extrusion-to-molding attachment section for attaching the molding attachment surface to the attachment extrusion and an extrusion-to-frame attachment section for attaching the attachment extrusion to the window frame. Each of the clip members has a recess portion for receiving the flange of the heat sink and the substrate to thereby firmly position the heat sink on the substrate.