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Your clients will end up having to download more and the web server will be sending data it doesn't have to.

A single, installed, working program (or set of programs) is a product.For example, if you are regularly dynamically creating a new graph image, you need to make sure a half saved version of the image file is not served to a browser.If this happens, the browser will display a corrupt image, or nothing at all.Image updating is useful if you have dynamic graphs or perhaps a webcam. The main trick is appending a date string after the image file name to make sure the browser does not use a cached version of the image.A simple bit of javascript can be used to request the browser to reload a new image at regular intervals. As the date string is appended as a The following files provide a simple demonstration of AJAX.

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