PUBLIC MARKS with tags dynamic & ajax

This script dynamically displays the number of people online on a page. Whenever a person leaves/visits the page the script will dynamically modify the number of people online without reloading the page.

Ajax, or Asynchronous JavaScript and XML, is an approach to Web application development that uses client-side scripting to exchange data with the Web server. As a result, Web pages are dynamically updated without a full page refresh interrupting the interaction flow. With Ajax, you can create richer, more dynamic Web application user interfaces that approach the immediacy and usability of native desktop applications.

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