因为portlet应用程序是共享资源，它们的属性在整个安装过程中是公有的。
Because portlet applications are Shared resources, their properties will be common across the entire installation.
与共享内存对象相似，对于以只读方式打开消息队列，应该把open_only属性传递给构造函数。
Similar to the case for a Shared memory object, a message queue that is opened only for reading will have the open_only attribute passed in the constructor.
在清单4中，使用open_only和read_only属性创建共享内存对象。
In Listing 4, you create the Shared memory object using the open_only and read_only attributes.
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