An anisotropic single-crystal polarizing prism for separation of the non-polarized beam into two orthogonally-polarized beams with minimal optical losses. A first instruction extracts any part of the field from a first register designated as a first source register, and executes a second instruction extracting any part of the field from a second general register designated as a second source register. A reflective image is provided on the first major surface of the substrate opposite the illumination source. If the recipient subscribes to the at least one of the add-on services, the method includes forming a post add-on service email, which includes performing, using the add-on service system, the at least one of the add-on services on at least a first portion of the email. The assembly includes a base that is pivotally connected to the transom.