To achieve high reliability, checkpointing and rollback-recovery techniques for distributed computing systems have been developed and discussed for over two decades. 為了使得分散式計算系統具有高可靠度，查核點(diǎn)與錯誤回復技術(shù)發(fā)展迄今以逾二十年。
More and more powerful laptop computers and PDAs, which are equipped with wireless communication interfaces, become possible participants of a distributed computing application. 愈來(lái)愈多具備有無(wú)線(xiàn)通訊介面的筆記型電腦或個(gè)人數位助理已擁有強大的計算能力，足以作為參與分散式計算的一員。
