Objects exist in a message path hierarchy and respond to messages generated by either the user or the system itself.
对象置身于消息传播的路径所构成的一个层级结构之中，响应由用户或者系统本身产生的各种消息。
On success, the user will have authenticated access to IBM DFS space and the NFS client will then be able to view the same file system hierarchy as the DFS client.
操作成功之后，用户将可以以身份验证的方式访问IBM DFS空间，而NFS客户端能够如dfs客户端一样浏览相同的文件系统层次结构。
The flowchart in Figure 8 summarizes how the hierarchy of authorization takes place while a user tries to create an item in the CM system.
图8所示的流程图总结了当用户试图在CM系统中创建项目时，授权机制如何发挥作用。
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