The ApplicationDomain class is a container for discrete groups of class
definitions. Application domains are used to partition classes that are in
the same security domain. They allow multiple definitions of the same
class to exist and allow children to reuse parent definitions.
Application domains are used when an external SWF file is loaded through
the Loader class. All ActionScript 3.0 definitions in the loaded SWF file
are stored in the application domain, which is specified by the
The LoaderContext class provides options for loading SWF files and other
media by using the Loader class. The LoaderContext class is used as the
The SecurityDomain class represents the current security "sandbox," also
known as a security domain. By passing an instance of this class to
The System class contains properties related to local settings and operations. Among these are settings for camers and microphones, operations with shared objects and the use of the Clipboard.