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Dojo is a third-party javascript toolkit for creating rich featured applications. Dojo is an Open Source DHTML toolkit written in JavaScript. It builds on several contributed code bases (nWidgets, Burstlib, f(m)), which is why we refer to it sometimes as a "unified" toolkit. Dojo aims to solve some long-standing historical problems with DHTML which prevented mass adoption of dynamic web application development. 

Just call the abort() method on the request.
No. XMLHttpRequest is only part of the Ajax equation. XMLHttpRequest is the technical component that makes the asynchronous server communication possible; Ajax is our name for the overall approach, which relies not only on XMLHttpRequest, but on CSS, DOM, and other technologies.

HTML_AJAX have been verified to work with -

  • Firefox 1.0+ 
  • Internet Explorer 5.5+ (5.0 should work but it has not been tested) Most things work with 
  • Safari 2+ 
  • Opera 8.5+

It is both. Ajax is a set of technologies being used together in a particular way.

JavaScript is in plain view to the user with by selecting view source of the page. JavaScript cannot access the local file system without the user permission. An AJAX interaction can only be made with the servers-side component from which the page was loaded. A proxy pattern could be used for AJAX interactions with external services. You need to be careful not to expose your application model in such as way that your server-side components are at risk if an immoral user to reverse engineer your application. As with any other web application, consider using HTTPS to secure the connection when confidential information is being exchanged.

Not totally. Most browsers offer a native XMLHttpRequest JavaScript object, while another one (Internet Explorer) require you to get it as an ActiveX object.

Not at all. Macromedia is an Adaptive Path client, and we’ve long been supporters of Flash technology. As Ajax matures, we expect that sometimes Ajax will be the better solution to a particular problem, and sometimes Flash will be the better solution. We’re also interested in exploring ways the technologies can be mixed (as in the case of Flickr, which uses both).

No. Or not yet. It is part of the DOM Level 3 Load and Save Specification proposal.

When a script is registered by the ScriptManager class, a type/key pair is created to uniquely identify the script. For identification purposes, the type/key pair name is always unique for identifying a script. Hence, there may be no duplication in type/key pair names.

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