Why a flash application can either use Remote or Local Sandbox . What is the problem if it’s using both of them ?
Say a flash application at one time communicating with a local file… and also communicating with some file on the server. Isn’t that allowed ?
WRT : http://help.adobe.com/en_US/ActionScript/3.0_ProgrammingAS3/WS5b3ccc516d4fbf351e63e3d118a9b90204-7e3f.html Why a flash application can either use Remote or Local Sandbox
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It is not allowed because of security reasons, if it was allowed to communicate with both you can potentially take files from the users machine and send them to a server on the web.