一个MAC地址是一个独一无二的字符串。由于它标识一个独特的物理设备——一个唯一的网卡——MAC地址，按照约定，在网卡中将永不会改变。
A MAC address is a unique character string, and since it identifies a specific physical device — one individual NIC — the MAC address, by convention, never changes for the life of the NIC.
除此之外，它还包含了通讯双方的电话号码，通讯持续随时间和通讯者手机的唯一通讯设备标识码。
Among other things, it contains the origin and destination number, the duration of a connection, and the unique mobile equipment identifier of the caller's handset.
其次，操作系统项，将创建指定的操作系统映像和引用 RAMDISK 设备对象 （通过其全局唯一标识符或 GUID）。
Second, an operating system entry is created that specifies the operating system image and references the RAMDISK device object (by its globally unique identifier, or GUID).
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