In a method, data processor and mail transport system for a mail item, the mail item has an electronic memory device physically associated therewith that contains electronically stored information that is relevant for the transport of the mail item. A set of sources and a set of sensors are arranged on an object such as a human body. The list may also be sorted or filtered to fill specific providers’ schedules first. The connectors are positioned between a plurality of building structural members. The shielding may be applied to walls of a building, consumer products such as magnetic disks, and the like. This ensures that only one of the bidirectional subscribers forwards the message so that no overloading of the radio system occurs.