Key to system is the idea of a "principal", which in this case is the triple of protocol, domain-name, and port. Each combination is isolated from any other combination at the process level.
Principal由协议、域名以及端口三部分组成，在进程级别不同的组合之间互相隔离，它是整个系统的关键部分。
The paper introduces the design idea and scheme of DSPPA public broadcasting system for Expo Ville Shanghai in combination with the requirements of National standard of public broadcasting(draft).
本文结合公共广播国家标准（报批稿）要求，介绍了世博村DSPPA公共广播系统设计思路及方案。
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