Improved devices, systems, and methods for sensing andor identifying signals from within a signal detection region are well-suited for identification of spectral codes. This is accomplished by using a portable device that enables anonymous communications between a sender and a recipient via an anonymous communications server computer. In addition, the portable communication terminal monitors amounts of data that are received by the preset time period each. Further, pieces of pointer information that indicate start addresses of storage address for the above-mentioned predetermined groups are stored.