Its initial value is equivalent to the USER (run time authorization ID) special register.
它的初始值等于特殊寄存器user中的值(运行时授权id)。
The first parameter is the user id to run the program under, and the second parameter is the program to run.
第一个参数是运行程序的用户id，第二个参数是要运行的程序。
The managed role is typed with the generic business object and points to the key attribute that will hold the relationship instance id at run time.
托管角色采用通用业务对象，指向将在运行时保存关系实例 ID 的键属性。
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