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Also, if one uses XML with CGI for a Web application, the server will generally have to use the form data to create an XML document, and then do something with it. But it takes a fair bit of processing to construct documents in this fashion, especially if a large amount of data is being sent. It is far nicer to simply have the client's browser create the XML document, and then send the finished product up via XMLHTTP. This helps take some of the strain off of the server and simplify the server-side code. An example of this sort of situation would be appending data to an XML document on the server. Rather than constantly querying a CGI form in order to construct the XML node that is to be appended to the document, one could just send up the node via XMLHTTP and have the server simply plunk it into the document.
Also, if one uses XML with CGI for a Web application, the server will generally have to use the form data to create an XML document, and then do something with it. But it takes a fair bit of processing to construct documents in this fashion, especially if a large amount of data is being sent. It is far nicer to simply have the client's browser create the XML document, and then send the finished product up via XMLHTTP. This helps take some of the strain off of the server and simplify the server-side code.
These are the basics of XMLHTTP, the kind of stuff that you'll find in the examples on the Microsoft Developers Network (MSDN). However, so much more can be done with this method of communication. I'll run through a few of the uses I've found for XMLHTTP in my applications, and any clever developer could find many more ways to make use of this object.
Important Links http://msdn.microsoft.com/xml/reference/scriptref/XMLHttpRequest_object.asp