硬体方面：目前支持大部分ATAPI介面极少数的SCSI介面。
Most of the hardware aspects: ATAPI interface currently supports a handful of SCSI interface.
现代网络硬体往往支持单一发送者向多名接收者有效广播和持续多播资料包。
Modern networking hardware often provides support for efficient broadcast and multicast of packets from a sender to multiple receivers.
一个给定的源也许并不被所有设备支持。也许因为源没有物理硬体持之，或者无法访问。
A given source may not always be available on every device. This could be because the source is not physically present or because it cannot currently be accessed.
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