Elementos de una aplicaion distribuida

Components of a Client Server Application
By Sue Smith, eHow Contributor
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Client Server applications are widely used over the Internet.
Client Server applications are widely used within a variety of contexts. In many cases, they are deployed over the Internet and are used for business, entertainment and organizational purposes. Although a ClientServer application functions as a coherent whole, there may be a number of distinct applications running within it, such as Database Management Systems and Web interfaces. Creating a Client Server application is often straightforward, providing developers understand how the component parts function and interact.
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1. Server* There are different types of servers, including Web and database. The server must be networked to connect it with other machines, for example, connecting it to the clients. The server may be operating within an organization, networked through a local intranet or it may be host to the data and associated content for publicly viewable websites. Essentially the server is a computer with serversoftware installed and running, connected to a network.
Database
* Whether the application is for private, restricted use or freely available use perhaps via the Web, the data will typically be modeled within a structured database system. In a typical Web model, this data may be stored within a relational system such as MySQL and administered using such interfaces as phpMyAdmin. For businesspurposes, the database may be managed within a powerful software system such as Oracle. The data should be modeled in a way that reflects the business or overall purpose of the Client Server application as a whole.
Data Connectivity
* A Client Server application will have the ability to query, update and maintain the data using one or more technologies. In a Web application, a server-sideprogramming language such as PHP or ASP may be used to connect to the data. This element in the application must be able to carry out whichever data processing is required by the program. Much of the central application logic may be reflected in the data connectivity element and the main functionality that the application is aiming to carry out will be facilitated here. In some applications, dataconnectivity is achieved within the same program element as the client interface.
Client Interface
* The user-facing element in a Client Server application will provide the means to interact with it. A typical website application will create this interface in the form of HTML. The HTML may be created and output by server-side programs and sent to the Web browser for display and interaction.For a business system operating within an organization, the interface may take the form of a desktop application, connecting and interfacing with the data. The client interface's role overall is sending a request to the server, which responds in turn with data.
Client-Side Styling and Dynamic Interactivity
* Particularly for a website application, the interface may be complemented bystyle elements such as images and CSS rules determining how it is presented to users. The interface may also be accompanied by client-side scripting such as JavaScript, enhancing its behavior when the user interacts with it using the mouse and keyboard. For a desktop application, such as that running within a business organization, the user interface will similarly involve images and other visualelements.
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