Adobe Flex 2.0 is a group of tools designed to help developers build applications that have the rich content and interactive features of the desktop in applications that can be accessed via a thin client. The tools essentially eliminate the need to refresh a Web page every time a user enters or receives new data. Flash Player is the client runtime for these applications.

In addition, Adobe, which added Flex to its offerings after acquiring Macromedia Inc. last month, will make its Flex Software Development Kit available for free. The kit includes the tools needed to develop, compile and deploy Flex applications. Adobe's new Flex Enterprise Services 2.0, designed to integrate front-end Internet applications with back-end data sources, will be free to a limited number of concurrent users on a single, nonclustered server.

Jeff Whatcott, Adobe's senior director of product marketing, said that the new version of Flex includes a set of services called Flex Enterprise Services 2.0, which is designed to help developers build a services-oriented client that can easily connect to multiple back-end data sources such as Java Message Service, Java Objects and radio frequency identification streaming data. This will allow Web applications developed with Flex to update data such as stock prices on a client at the same time the data is updated on a server, he said.

"Those developers are in our target because they have the skills and the infrastructure on the middle tier, [and] they need a services-oriented client," he said. "When data updates remotely, it is automatically updated on the screen. The ideal technology for doing that is going to be Flex [because] it gives you the richness of desktop software, but it gives you the deployment model of the Web."

Whatcott said an expansion of the back-end data sources developers can use with their front-end Web applications will give the tool an advantage over vendors such as Microsoft Corp. and Sun Microsystems Inc. They both offer tools that use Asynchronous JavaScript and XML, another programming technique used to build the rich Internet applications. But those tools presume that the back-end data source already is exposed through XML as a Web Service, he said.