您可以采用已有的会话bean来访问一个或多个主题和队列，而不必重建整个基础设施。
Rather than rebuild your entire infrastructure, you can adapt existing session beans to access one or more topics and queues.
第4章讨论的一些主题，例如会话管理，貌似很有价值，但是归纳起来也就只有这么一句话。
Chapter four has some topics that look promising, such as one on session management. However, the totality of the text is this sentence.
HRPortletService查找使用登录主题的人力资源应用程序会话。
HRPortletService looks up the HR application session bean using the login subject.
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