| 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 Macromedia Flash Communication 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.
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| 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 | The SharedObject class is used to read and store limited amounts of data on a user's computer. |
| 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). |
