O’Reilly: Inside RIA

If you have had an opportunity to look at the Adobe Flash Collaboration Service (AFCS) you could see that there is a huge opportunity to do interesting multi-user applications without needing to write all of the server side code. However there is the challenge of how do you control who comes into your application and what they are allowed to do. In addition, keeping your application credentials safe in case your SWF file was decompiled. So as the title suggests you can use a service like Facebook to take care of the users authentication and Flash Remoting for the application authentication.