Abstract: A system for communication, the system including: (a) an interface configured to receive detection information indicative of a detection of a portable identification object in a vicinity of a detector that is located in a physical site that includes multiple transaction generating entities; (b) a content manager configured to selectively retrieve from a database content of at least one of the transaction generating entities, based on client preferences of a client account that is associated with the portable identification object; (c) a messages integration module configured to generate a message based on at least part of the retrieved content; and (d) a transmitter configured to transmit the message to a portable computer associated with the client account.