MACROMEDIA FLASH MX 2004-USING FLASH Use Manual page 218

You can add multiple screens to a document, and you can nest screens within other screens, in as
many levels as you want. A screen that is inside another screen is the child of that screen. A screen
that contains another screen is the parent of that screen. If a screen is nested several layers deep, all
the screens above that screen are its ancestors. Screens that are at the same level are sibling screens.
All screens nested in another screen are its descendants. A child screen contains all the content of
its ancestor screens.
The Screen Outline pane for a Flash Slide Presentation containing screens nested three levels deep.
About using preloaders with screen-based documents
If you want to include a preloader with your screen-based document, one way to do this is to
create the preloader as a separate SWF file (non-screen-based), and load the SWF file for the
screen-based document from within the preloader SWF.
You cannot create a preloader within a screen-based document, because all screens in a document
are located on the first frame of the root Timeline, so you cannot call or load other frames.
Slide screens and form screens (Flash Professional only)
You can create two types of screens in a document: slide screens and form screens. A Flash Slide
Presentation uses the slide screen as the default screen type. A Flash Form Application uses the
form screen as the default screen type. However, you can mix slide screens and form screens in any
screen-based document to take advantage of the functionality of each type of screen and create
more complex structure in a presentation or application.
218 Chapter 12: Working with Screens (Flash Professional Only)
Top-level slide has three children,
Slide 1, Slide 2, and Slide 3.
Slide 1 has one child
and one grandchild.
Slide 4 is a child of Slide 1.
Slide 5 is a child of Slide 4.