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，查核點與錯誤回復技術發展迄今以逾二十年。
More and more powerful laptop computers and PDAs, which are equipped with wireless communication interfaces, become possible participants of a distributed computing application. 愈來愈多具備有無線通訊介面的筆記型電腦或個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。
