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Improved browser capabilities, enabled by faster computers, have not only made complex and rich web applications possible, but have also changed the way we use computers. Techniques like AJAX, and powerful JavaScript libraries that abstract away painful cross-browser issues, have resulted in client-side (in the browser) programming becoming one of the most important fields in modern software development. Despite this, web applications remain restricted by the user interface capabilities of JavaScript and the performance of JavaScript when running large programs. Ways around these difficulties include web-programming frameworks such as Flash, AIR, Flex, and Silverlight, which have their own programming and user interface models.