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The set of object classes for the System V IPC component is shown in Table 38. A class is defined for each System V IPC abstraction. Additionally, a class is defined for individual messages within a message queue, so that messages can be individually labeled and controlled. By default, the SID of a System V IPC object will be set to the SID of the creating process. For System V message queues, a SID attribute will be bound to each message. The SID of the sender of the message will be used by default.