A flow processing facility, which uses a set of artificial neurons for pattern recognition, such as a self-organizing map, in order to provide security and protection to a computer or computer system supports unified threat management based at least in part on patterns relevant to a variety of types of threats that relate to computer systems, including computer networks. The method comprising the steps of displaying the subject image ; displaying at least one mask over the subject image wherein at least part of the or each mask extends to the periphery of the subject image ; and defining the selected region as those parts of the subject image not covered by a mask. An intermediate result obtained in the filtering process is stored in a register. The communication device ends the transmission of the preset car finder signal when a predetermined condition is met. The method and circuits provide a signal signature of each of one or more groups of the static pervasive signals and then monitoring the signal signature for any change of logic level.