It runs on the server side and the client code calls it via a remote procedure call.
它运行在服务器端，并且客户机代码通过一个远程过程调用来调用它。
When the client makes a remote procedure call, it contacts the name service database to find information about the server system.
客户机发出远程过程调用，此时它会联系名称服务数据库，以寻找服务器系统的相关信息。
This interface registration is needed because when the client makes a remote procedure call to the server, it checks if it is compatible with the server.
需要注册接口是因为，客户机在向服务器发出远程过程调用时，要检查它是否与服务器兼容。
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