They call it Ajax (Asynchronous JavaScript + XM)

http://www.adaptivepath.com/publications/essays/archives/000385.php
  • standards-based presentation using XHTML and CSS;
  • dynamic display and interaction using the Document Object Model;
  • data interchange and manipulation using XML and XSLT;
  • asynchronous data retrieval using XMLHttpRequest;
  • and JavaScript binding everything together.
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