The flash.system package contains classes for accessing system-level functionality, such as security, garbage collection, etc.

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	Function	Description
	fscommand	Lets the SWF file communicate with either Flash Player or the program hosting Flash Player, such as a web browser.

	Class	Description
	ApplicationDomain	The ApplicationDomain class is a container for discrete groups of class definitions.
	Capabilities	The Capabilities class provides properties that describe the system and runtime that are hosting the application.
	ImageDecodingPolicy	The ImageDecodingPolicy class provides values for imageDecodingPolicy in the LoaderContext class.
	IME	The IME class lets you directly manipulate the operating system's input method editor (IME) in the Flash runtime application that is running on a client computer.
	IMEConversionMode	This class contains constants for use with the IME.conversionMode property.
	JPEGLoaderContext	The JPEGLoaderContext class includes a property for enabling a deblocking filter when loading a JPEG image.
	LoaderContext	The LoaderContext class provides options for loading SWF files and other media by using the Loader class.
	MessageChannel	The MessageChannel class provides a mechanism for a worker to communicate with another worker.
	MessageChannelState	This class defines constants that represent the possible values for the MessageChannel class's state property.
	Security	The Security class lets you specify how content in different domains can communicate with each other.
	SecurityDomain	The SecurityDomain class represents the current security "sandbox," also known as a security domain.
	SecurityPanel	The SecurityPanel class provides values for specifying which Security Settings panel you want to display.
	System	The System class contains properties related to local settings and operations.
	SystemUpdater	The SystemUpdater class allows you to update modules of the Flash Player, such as the DRM module for Adobe Access, as well as the Flash Player itself.
	SystemUpdaterType	The SystemUpdaterType class provides constants for a system update.
	TouchscreenType	The TouchscreenType class is an enumeration class that provides values for the different types of touch screens.
	Worker	A Worker object represents a worker, which is a virtual instance of the Flash runtime.
	WorkerDomain	The WorkerDomain class provides a way to create Worker objects and access them.
	WorkerState	This class defines constants that represent the possible values of the Worker class's state property.