MACROMEDIA FLASH 8-LEARNING ACTIONSCRIPT 2.0 IN FLASH Manual page 288

Other language elements
There are other language elements that make up ActionScript, outside of classes. These
include directives, constants, global functions, global properties, operators, and statements.
For information on how to use each of these language elements, see the following topics:
Chapter 5, "Syntax and Language Fundamentals"
Chapter 6, "Functions and Methods"
You can find a list of these language elements in the following sections of the ActionScript 2.0
Language Reference:
Compiler Directives
Constants
Global Functions
Global Properties
Operators
Statements
Top-level classes
The top level contains the ActionScript classes and global functions, many of which provide
core functionality for your applications. Core classes, borrowed directly from ECMAScript,
include Array, Boolean, Date, Error, Function, Math, Number, Object, String, and System.
To find more information on each class, see the following table.
The CustomActions and XMLUI classes are available only in the Flash authoring
environment.
Class
Accessibility
Array
AsBroadcaster
Boolean
288 Classes
Description
The Accessibility class manages communication between SWF files
and screen reader applications. You use the methods of this class with
the global property to control accessible properties for movie
_accProps
clips, buttons, and text fields at runtime. See Accessibility.
The Array class represents arrays in ActionScript and all array objects
are instances of this class. The Array class contains methods and
properties for working with array objects. See Array.
Provides event notification and listener management capabilities that
can be added to other objects. See AsBroadcaster.
The Boolean class is a wrapper for Boolean (
Boolean.>.
or ) values. See
true false