接下来是代码执行，可能是直接执行，也可能过一段时间之后执行，其执行结果又作为另一请求的一部分被发往这个世界的另一参与者，以此类推。
This is followed, either directly or after some time has passed, by execution of code - as part of which a request might be sent to yet another part of the universe, and so on.
对于将用例图中的参与者转换成类图中有效的抽象，镜像映象模式和会话虚包模式是很有用的，这样最终将能够更清楚地转换成代码。
The Mirror Image and Session Facade patterns are useful for changing actors in use case diagrams into valid abstractions in class diagrams, which ultimately results in a cleaner translation to code.
Snippets是源代码示例的混合体，例如，把菜单项添加到多个视图以及对象中的简短示例代码，以便扩展多方聊天的参与者列表以及其他功能。
Snippets is a grab bag of source code examples, for instance, short examples that add menu items to different views and objects, that extend the n-way chat participants list, and so on.
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