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copied!<p>Luca Tettamanti gave good answers to your specific questions already, so I'll just offer some additional info on the general subject:</p> <p>I've implemented a simple plugin API for a Flex app using the <a href="http://livedocs.adobe.com/flex/3/langref/mx/modules/ModuleManager.html" rel="nofollow noreferrer"><code>ModuleManager</code></a> class (and the other stuff in the <a href="http://livedocs.adobe.com/flex/3/langref/mx/modules/package-detail.html" rel="nofollow noreferrer"><code>mx.modules</code></a> package.) The gist of it is that you subclass plugins from <code>ModuleBase</code> and use <code>ModuleManager</code> in the host app to load them. Then you have the plugins implement a common interface (e.g. <code>IMyAppPlugin</code>) and use some sort of a <a href="http://en.wikipedia.org/wiki/Facade_pattern" rel="nofollow noreferrer">facade</a> to represent and implement the interface to the host application that the plugins can use (e.g. <code>MyAppFacade implements IMyAppFacade</code>.) Whenever plugins are loaded, inject this facade reference into them.</p> <p>The topic <a href="http://livedocs.adobe.com/flex/3/html/help.html?content=modular_2.html" rel="nofollow noreferrer">"Modular applications overview"</a> in the Flex 3 help has some good info (the subchapter <em>"Module domains"</em> discusses application domains in the context of modules.) Here's an excerpt:</p> <blockquote> <p><em>"By default, a module is loaded into a child domain of the current application domain. You can specify a different application domain by using the applicationDomain property of the ModuleLoader class."</em></p> </blockquote> <p>The topic <a href="http://livedocs.adobe.com/flex/3/html/help.html?content=18_Client_System_Environment_5.html#119371" rel="nofollow noreferrer">"Using the ApplicationDomain class"</a> goes into more depth on the subject of application domains, and you should definitely read it if you haven't already.</p>

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