The top level contains the core ActionScript classes and global functions.

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	Class	Description
	Accessibility	The Accessibility class manages communication with screen readers.
	arguments	An arguments object is used to store and access a function's arguments.
	Array	The Array class lets you access and manipulate indexed arrays.
	AsBroadcaster	Provides event notification and listener management capabilities that you can add to user-defined objects.
	Boolean	The Boolean class is a wrapper object with the same functionality as the standard JavaScript Boolean object.
	Button	All button symbols in a SWF file are instances of the Button object.
	Camera	The Camera class is primarily for use with Flash Media Server, but can be used in a limited way without the server.
	Color	Deprecated since Flash Player 8 — The Color class has been deprecated in favor of the flash.geom.ColorTransform class.
	ContextMenu	The ContextMenu class provides runtime control over the items in the Flash Player context menu, which appears when a user right-clicks (Windows) or Control-clicks (Macintosh) on Flash Player.
	ContextMenuItem	The ContextMenuItem class allows you to create custom menu items to display in the Flash Player context menu.
	CustomActions	The methods of the CustomActions class allow a SWF file playing in the Flash authoring tool to manage any custom actions that are registered with the authoring tool.
	Date	The Date class lets you retrieve date and time values relative to universal time (Greenwich mean time, now called universal time or UTC) or relative to the operating system on which Flash Player is running.
	Error	Contains information about an error that occurred in a script.
	Function	Both user-defined and built-in functions in ActionScript are represented by Function objects, which are instances of the Function class.
	Key	The Key class is a top-level class whose methods and properties you can use without a constructor.
	LoadVars	You can use the LoadVars class to obtain verification of successful data loading and to monitor download progress.
	LocalConnection	The LocalConnection class lets you develop SWF files that can send instructions to each other without the use of fscommand() or JavaScript.
	Math	The Math class is a top-level class whose methods and properties you can use without using a constructor.
	Microphone	The Microphone class lets you capture audio from a microphone attached to the computer that is running Flash Player.
	Mouse	The Mouse class is a top-level class whose properties and methods you can access without using a constructor.
	MovieClip	The methods for the MovieClip class provide the same functionality as actions that target movie clips.
	MovieClipLoader	This class lets you implement listener callbacks that provide status information while SWF, JPEG, GIF, and PNG files are being loaded into movie clips.
	NetConnection	The NetConnection class provides the means to play back streaming FLV files from a local drive or HTTP address.
	NetStream	The NetStream class provides methods and properties for playing Flash Video (FLV) files from the local file system or an HTTP address.
	Number	The Number class is a simple wrapper object for the Number data type.
	Object	The Object class is at the root of the ActionScript class hierarchy.
	PrintJob	The PrintJob class lets you create content and print it to one or more pages.
	Selection	The Selection class lets you set and control the text field in which the insertion point is located (that is, the field that has focus).
	SharedObject	Shared objects offer real-time data sharing between multiple SWF files.
	Sound	The Sound class lets you control sound in a movie.
	Stage	The Stage class is a top-level class whose methods, properties, and handlers you can access without using a constructor.
	String	The String class is a wrapper for the string primitive data type, and provides methods and properties that let you manipulate primitive string value types.
	System	The System class contains properties related to certain operations that take place on the user's computer, such as operations with shared objects, local settings for cameras and microphones, and use of the Clipboard.
	TextField	The TextField class is used to create areas for text display and input.
	TextFormat	The TextFormat class represents character formatting information.
	TextSnapshot	TextSnapshot objects let you work with static text in a movie clip.
	Video	The Video class enables you to display live streaming video on the Stage without embedding it in your SWF file.
	XML	Use the methods and properties of the XML class to load, parse, send, build, and manipulate XML document trees.
	XMLNode	An XML document is represented in Flash by the XML class.
	XMLSocket	The XMLSocket class implements client sockets that let the computer running Flash Player communicate with a server computer identified by an IP address or domain name.
	XMLUI	The XMLUI object enables communication with SWF files that are used as custom user interfaces for the Flash authoring tool's extensibility features (such as Behaviors, Commands, Effects, and Tools).