他们不想让自己的最终用户注销表。

They do not want to let their end users cancel forms.

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为了确保最高的安全性，应该在操作的用户凭证变化之前或在用户注销时执行清除。

To maximize security, this should be done before every operation that involves a change in credentials, as well as when the user logs out.

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第二，它允许交换个人设置，因此在用户注销离开一项联合资源的时候，可以较好地管理Session。

Second, it allows the communication of privacy settings and manages sessions better once the person has logged out of a federated resource.

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