Lately, Adobe Flex has been getting more and more attention in programming community. Especially after the launch of open source version of Flex SDK developers are able to make rich Internet applications (RIA) using Flex, which (as everybody knows) produces a flash file (swf) that can be used in any web application. The article will focus on the following topics:

1. Communication between Action Script (HTTPService) and .NET (HTTP Handler);
2. Security - securing HTTP Handler calls from unauthorized access;
3. ASP.NET Forms Authentication and Authorization through Flex;
4. ASP.NET Handlers and session management;

It is assumed that the reader is familiar with basic concepts of ASP.NET handlers, forms authentication, and Adobe's Action Script.
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