...structure. This dramatically simplifies deployment, allowing self-contained applications to be simply copied to the targetserver's application directory and thus be up and running immediately with the desired settings. The new configuration...
http://msdn.microsoft.com/magazine/36348f24-5564-4cb2-9cb1-3efd76b4cf59
...The Javascript wrapper passes calls and request data to the flash "proxy". The browser plugin first checks the targetserver for permission via its crossdomain.xml server opt-in policy (if found). If and only if authorized, the flash...
http://ajaxpatterns.org/Flash-enabled_XHR