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The web server
When a request comes into the Web server, the Web server simply passes the request to the program best able to handle it. The Web server doesn't provide any functionality beyond simply providing an environment in which the server-side program can execute and pass back the generated responses. The server-side program usually provides for itself such functions as transaction processing, database connectivity, and messaging.
The application server
Such application server clients can include GUIs (graphical user interface) running on a PC, a Web server, or even other application servers. The information traveling back and forth between an application server and its client is not restricted to simple display markup. Instead, the information is program logic. Since the logic takes the form of data and method calls and not static HTML, the client can employ the exposed business logic however it wants.
In most cases, the server exposes this business logic through a component API, such as the EJB (Enterprise JavaBean) component model found on J2EE (Java 2 Platform, Enterprise Edition) application servers.

<form> - tag is used for sending data from the client
browser to the server.
There is no way for submitting a page if there is no
<form> - tag in the page.

form is usefully for posting the data from one page to another
.and this done by tow way either submitting the form by
submit button or through javascript function.

window.history.go(+1) use in java script;
or
onunload =window.history.go(-1) in body tag

These codes are not suitable for disable Browsers back
button and Back Button on Mouse Right Click.
please write the code.