Most ActionScript classes are organized in the Top Level package. Classes that were new in Flash Player 8, such as BitmapData, Rectangle, and various filters classes, are in the flash.* packages.
|The Top Level package contains the core ActionScript classes and global functions.
flash.display package contains the BitmapData class for image manipulation.
flash.external package contains the ExternalInterface class.
|The flash.filters package contains classes for the filter effects that were new in Flash Player 8.
flash.geom package contains geometry classes, such as Point, Rectangle, and Matrix, that support the BitmapData class and the bitmap caching feature, which were new in Flash Player 8.
|The flash.net package contains classes for uploading and downloading files.
|The flash.text package contains the TextRenderer class, which lets you set the quality used by advanced anti-aliasing and define custom settings for fonts used by advanced anti-aliasing.
|The mx.lang package contains the Locale class, which supports multilanguage text.
|The System package contains the capabilities, the input method editor (IME), and security classes.
|The TextField package contains the StyleSheet class for applying CSS styles to text.