当这种映射发生时，硬件将负责访问(和保护)，客户操作系统在使用该设备时，就仿佛它不是一个虚拟系统一样。

When this mapping occurs, the hardware takes care of access (and protection), and the guest operating system can use the device as if it were a non-virtualized system.

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保护服务器(ptserver)—负责维护保护数据库(PDB)，此数据库建立了用户或组名称与其内部的数值的AFS标识符之间的映射。

Protection server (ptserver) - Maintains protection database (PDB) that maps between user or group names and their internal numerical AFS identifiers.

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此方法定义受保护系统的各个组件，并将这些组件映射到能够对其进行访问的用户组。

This methodology defines various components of the protected system and maps those components to the groups of users who can access them.

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