Smart Card System

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Chapter 1: Client- Server Technology

1.1 Client-Server Concept and Architecture

The term "client/server" implies that clients and servers are separate logical entities that work together, usually over a network, to accomplish a task. Client/server is more than a client and a server communicating across a network. Client/server uses asynchronous and synchronous messaging techniques with the assistance of middle-ware to communicate across a network.

Client/Server uses this approach of a client (UI) and the server (database I/O) to provide its robust distributed capabilities. The company, Sigma has used this technique for over 15 years to allow its products to be ported to multiple platforms, databases, and transaction processors while retaining a product's marketability and enhanced functionality from decade to decade.

Sigma's client/server product uses an asynchronous approach of sending a message to request an action and receives a message containing the information requested. This approach allows the product to send intensive CPU processing requests to the server to perform and return the results to the client when finished.

Sigma's architecture is based on re-usability and portability. Sigma currently uses a standard I/O routine, which is mutually exclusive from the