Provided is a distributed system and method for enabling new and useful location dependent features and functionality to mobile data processing systems. Mobile data processing systems (MSs) interact with each other as peers in communications and interoperability. Data is shared between mobile data processing systems to carry out novel Location Based eXchanges (LBX) of data for new mobile applications. Information which is transmitted inbound to, transmitted outbound from, or is in process at, a mobile data processing system, is used to trigger processing of actions in accordance with user configured permissions, charters, and other configurations. In a preferred embodiment, a user configurable platform is provided for quickly building well behaving LBX applications at MSs and across a plurality of interoperating MSs.