Application Domain

The application domain, not to be confused with problem domain, represents the memory location of an application's given definitions. When a .swf file is published, the compiler bundles all application definitions into that of an application domain. If a .swf is loaded into another .swf, the definitions of both .swfs remain partitioned from one another. This ensures that the definitions of one application don't interfere with the naming conventions of possibly same named definitions between the two .swf files.

You instantiate an ApplicationDomain by importing the flash.system.ApplicationDomain class. The ApplicationDomain class, when instantiated, accepts as an optional parameter a reference to a preexisting applicationDomain. Specifying a preexisting applicationDomain lets the devised partition use definitions from the passed-in applicationDomain (appDom for short).