16. The system of claim 15 , wherein the client unit comprises: a converter unit to convert the second parameter into a messenger understandable request; and a transmitter unit to transmit the messenger understandable request and to intimate a messenger of a result of invocation of the service to the messenger.
16. The system of claim 15 , wherein the client unit comprises: a converter unit to convert the second parameter into a messenger understandable request; and a transmitter unit to transmit the messenger understandable request and to intimate a messenger of a result of invocation of the service to the messenger. 17. The system of claim 16 , wherein: the client unit receives an additional message body having the additional information; the parser unit parses the additional message body into additional parts representing the additional information; the interpreter unit interprets the additional parts of the additional message body; and the identifier unit identifies the service and the backend system based on the interpreted parts and the interpreted additional parts.