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A Flash document can load data from an external source by using one of the following data loading calls: XML.load(), XML.sendAndLoad(), LoadVars.load(), LoadVars.sendAndLoad(), loadVariables(), loadVariablesNum(), MovieClip.loadVariables(), XMLSocket.connect(), and Macromedia Flash Remoting (NetServices.createGatewayConnection). Also, a SWF file can import runtime shared libraries (RSLs), or assets defined in another SWF file, at runtime. By default, the data or RSL must reside in the same domain as the SWF file that is loading that external data or media.
To make data and assets in runtime shared libraries available to SWF files in different domains, you should use a cross-domain policy file. A cross-domain policy file is an XML file that provides a way for the server to indicate that its data and documents are available to SWF files served from certain domains, or from all domains. Any SWF file that is served from a domain specified by the server's policy file is permitted to access data or RSLs from that server.
If you are loading external data, you should create policy files even if you don't plan to port any of your files to Flash Player 7. If you are using RSLs, you should create policy files if either the calling or called file is published for Flash Player 7.
For more information, see About allowing cross-domain data loading.
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