Explain the Communications of Request/Response

Communications requirements for message or procedural- based interaction are very similar. Application interaction (client-server) should be removed from the underlying intrinsics of network programming at all costs. Communications modules for client-server must provide base support such as send and receive to the CSMsgInterface(). This process may be coded form scratch as is necessary for many systems, or a distributed message- oriente middleware product could be used for this transfer.

Generally messages need to be transferred from one system to another. Coding this by hand, in addition to supporting multiple protocols and operating systems is an arduos task.Relief is available from some messaging systems that provide simple four-or five-verb APIs to mange message communications. MessageExpress from Momentum software and others provide such products. More advanced products are available as well that provide advanced distributed queuing. These products surface a named queue interface to both client and server. All subsequent communication between the components is based on directly en-queuing and de-queuing the distributed mechanism. Momentum Software provides this ability with xIPC, as does DEC with MessageQ.