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   Programming a BEA Tuxedo Application Using COBOL

In request/response communication mode, one software module sends a request to a second software module and waits for a response. Because the first software module performs the role of the client, and the second, the role of the server, this mode is also referred to as client/server interaction. Many online banking tasks are programmed in request/response mode. For example, a request for an account balance is executed as follows:

1. A customer (the client) sends a request for an account balance to the Account Record Storage System (the server).

2. The Account Record Storage System (the server) sends a reply to the customer (the client), specifying the dollar amount in the designated account.

   Example of Request/Response Communication in Online Banking

   

Once a client process has joined an application, it can then send the request message to a service subroutine for processing and receive a reply message.