用户直接从自己的计算机拨号接入公告版系统的主机。
Subscribers dial directly from their computers into the BBS host computer.
从系统管理员的角度来看，这样更容易管理主机和用户访问控制。
It makes for easier management of host and user control access from a system administrators point of view.
使用安全凭据连接到虚拟主机的用户。
The user which connects to a virtual host using credentials.
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