可以注册多个用户出口，在这样的情况下，将按照已定义的顺序调用它们(有关该顺序的详细信息，请参阅有关mqsichangeflowuserexits命令的参考资料)。
Many user exits can be registered, in which case they are invoked in a defined order (see the reference on the mqsichangeflowuserexits command for details on this order).
表示使用者定义的资料值，该值可以在执行命令时传递至命令。
Represents a user defined data value that can be passed to the command when it is executed.
表示使用者定义的资料值，该值可以在执行命令时传递至命令。
Represents a user defined data value that can be passed to the command when it is executed.
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