I know that AJAX can be used in conjunction with PHP.

Can it also be used to interact with other "server-side" languages as well, for example ASP, ASP.NET, ColdFusion?

Yes, for instance if you use GET method. Any server side script that can use the GET method to retrieve variables from the url can also process them. Same with post. Any script that can retrieve variables from the POST array can process them. And regardless of the script, it all gets outputted back to client as html.

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