This document is intended for programmers who are familiar with Adobe Flex, ActionScript 3.0, MXML, XML, and using Adobe Flex Builder (or the Adobe Flex SDK compiler) who want to develop a Flex application that functions within Workspace ES.

You can create Flex applications to provide data capture capabilities in the same manner as a form created in Adobe LiveCycle Designer ES or Adobe Acrobat®, and then enable it for use within LiveCycle Workspace ES. If you have an existing Flex application, you can also enable it for use within LiveCycle Workspace ES. Flex applications, such as PDF or HTML forms, can be associated with automated processes to capture data. The reason that you use a Flex application instead of a regular form created in Designer ES or Acrobat is to provide an enriched user experience.

A Flex application provides an enriched user experience by providing different visualizations and integrations for tasks to be created that go beyond those offered by PDF forms, HTML forms, and form guides. For instance, dashboards can be presented to users, audio and video can be provided for training or Help purposes, and more advanced user-interface components can be incorporated.

Source: help.adobe.com