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There are many sites claming that adobe flash and flex can be used an an alternative to ajax.
Is this true. Flash is used to display video content on a web page right?
How can it be usd to replace ajax?
Javacript/ajax are conceptually very similar to ActionScript/Flash. (ActionScript is the Flex programming language.)
Actionscript is a strict superset of javascript with a bunch of extra capabilties and extra features for making people who like early-binding languages comfortable. (Like declaring variable types.)
Instead of running in the js virtual machine in your browser, like javascript, it runs in the VM in Flash.
Instead of using ajax to interact asynchronously with a host in the background, Adobe has its own very similar capabilities.
It was all really handy before javascript/ajax bulked out. And it has the portable AIR VM libraries for Windows, iOS, and linux, so it can run without being hosted in a browser.
Adobe is deemphasizing this technology though because they have seen that the future is HTML 5.
Example press hyperbole:
http://www.pcworld.com/businesscenter/article/243130/adobe_flash_vs_html5.html
http://www.zdnet.com/blog/networking/flash-is-dead-long-live-html5/1633