A horizontally mounted shelf assembly includes an elongated support rail, at least one accessory slidaby connected with the support rail, and at least one stretch releasing adhesive strip arranged between the support rail and a wall for securing the shelf assembly to the wall. Assign a priority to the received broadcast signal based on the parameters, and store the parameters and priority in memory. The transaction management system has contract DB storing plural sets of contract information each consisting of a user ID, a customer code, an ISP code, an accounted party code specifying carrier, and so on.