Identifying user behaviors via remote control signal broadcasts may be provided. Each message has a message header configured to include a plurality of header fields, where the message header includes a suppression header field that indicates a request to suppress at least one header field in at least one subsequently sent or received message. Suitable anhydrides suitable for the present invention include acetic and propionic, with acetic anhydride being preferred. The mounting fastener includes a portion configured to be retained by the base. The invention furthermore relates to a photochromic composition and to the use of the proton-translocating retinal proteins and the photochromic composition.