Abstract: Method of and apparatus for point-to-point communication between a sender (SRV(m)) and a receiver (SRV(m)) by means of messages with flexible message formats (ILMF) wherein any of said messages includes: a header with a least message definition references (MSG ID. MSG CLASS, MSG VERSION, MSG CREATOR), a sender identifier (SENDER ID) and a destination address (DESTINATION ADDRESS); message content regarding: number of fields (FIELD COUNT) and content of any field (FIELD(1), . . . ); number of objects (OBJECT COUNT) and content of any object (OBJECT(1), . . . ); number of field mappings (MAP COUNT) and content of any field mapping (MAP(1), . . . ), any field mapping being usable by predetermined fields; number of actions (ACTION COUNT) and content of any actions (ACTION(1), . . . ), any action being at least usable by predetermined fields.