发送服务器仅将用户标识（X.509 证书、主体名、或基于初始登录所使用的凭据的专用名称 (DN)）发送到目标服务器。

The sending server only sends the user identity (X.509 certificate, principal name, or distinguished name (DN) based on the credentials used for the initial login) to the target server.

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提供一个专用空间来标识应用商标和用户位置。

Provide a dedicated space for identifying the application brand and user location.

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