MacやWinのアイコンをFlex内で読み込めます。 FlexLib updates: new IconLoader component, bugfixes http://dougmccune.com/blog/2007/09/11/flexlib-updates-new-iconloader-component-bugfixes/

Application.application.parametersで取れます。 Passing flashvars to Flex http://www.cfcdeveloper.com/index.cfm/2007/9/11/Passing-flashvars-to-Flex