系統(tǒng)之間并不是孤立的,它們利用網(wǎng)絡(luò)進(jìn)行通訊連接到一起,從一個單獨(dú)的系統(tǒng)來看,網(wǎng)絡(luò)可以視為一個I/O設(shè)備,當(dāng)系統(tǒng)復(fù)制一串字節(jié)到網(wǎng)絡(luò)適配器時,數(shù)據(jù)流經(jīng)過網(wǎng)絡(luò)到達(dá)另外一臺機(jī)器,而不是到達(dá)本地磁盤驅(qū)動器. 相似的,系統(tǒng)可以讀取從其他機(jī)器發(fā)送來的數(shù)據(jù),并把數(shù)據(jù)復(fù)制到自己的主存. 基于網(wǎng)絡(luò)復(fù)制信息的功能,從一臺主機(jī)復(fù)制信息到另外一臺主機(jī)是計(jì)算機(jī)系統(tǒng)最重要的用途之一.

The system is not isolated, they use network communication and connected together. From a separate system, network can considereda I/O device, when the system copy a sequence bytes arrived the network adapter, data flow passed network and arrived another machinee, rather than local disk drive. Similary, system can read data send from another machine and copy data in itself main memory. Base the network copy information function, copy information for a machine arrived another machine is one of the best important application.