Screens provide an authoring user interface with structural building blocks that make it easy for you to create complex, hierarchical Flash documents, such as slide presentations or form-based applications.
Screens let you structure complex applications without using multiple frames and layers in the Timeline, and without viewing the Timeline.
When you author a screen-based document, the screens are arranged in a structured hierarchy that you create. To structure the document, nest screens in a branching tree. You can easily preview and modify the structure of a screen-based document.

To author a screen-based document, you first create a Slide Presentation or Form Application document. Then you add screens, configure the screens and add content, and add behaviors to create controls and transitions for the screens.