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Dfference Between Web Server and Application Server

August 7, 2009
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Web server:

A Web server handles the HTTP protocol. When the Web server receives an HTTP request, it responds with an HTTP response, such as sending back an HTML page. To process a request, a Web server may respond with a static HTML page or image, send a redirect, or delegate the dynamic response generation to some other program such as CGI scripts, JSPs (JavaServer Pages), servlets, ASPs (Active Server Pages), server-side JavaScripts, or some other server-side technology. Whatever their purpose, such server-side programs generate a response, most often in HTML, for viewing in a Web browser.

Application Server:

As for the application server, according to our definition, an application server exposes business logic to client applications through various protocols, possibly including HTTP. While a Web server mainly deals with sending HTML for display in a Web browser, an application server provides access to business logic for use by client application programs. The application program can use this logic just as it would call a method on an object.

Rational ClearCase
By radha krishnan, On 2/14/08 5:07 AM

IBM Rational ClearCase

Rational ClearCase is a software tool for revision control (configuration management, Software Configuration Management (SCM) etc) of source code and other software development assets. It is developed by the Rational Software division of IBM. ClearCase forms the base of version control for many large and medium sized businesses and can handle projects with hundreds or thousands of developers.Rational supports two types of SCM configurations, Unified Change Management (UCM), and base ClearCase. UCM provides an out-of-the-box SCM configuration while base ClearCase supplies all the basic tools to make it very configurable and flexible. Both can be configured to support a wide variety of SCM needs.

ClearCase can run on a number of platforms including Linux, Solaris and Windows. It can handle large binary files, large numbers of files, and large repository sizes. It handles branching, labeling, and versioning of directories.

ClearCase was developed by Atria Software and first released in 1992 on UNIX and later on Windows. Some of the Atria developers had worked on an earlier system: DSEE (Domain Software Engineering Environment) from Apollo Computer. After Hewlett-Packard bought Apollo Computer in 1989, they left to form Atria. Atria later merged with Pure Software to form PureAtria. That firm merged with Rational Software, which was purchased by IBM. IBM continues to develop and market ClearCase. It is a popular product used by software production companies.

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