Citibank, for example, has its computer hooked up to a communications system which keeps it in contact with other branches throughout the world 24 hours a day.
外商銀行的營運作業多已走上電腦化，目前花旗台北分行已將電腦和國際電信系統結合，能廿四小時和全球各分行保持密切聯繫，隨時獲悉各地分行的營運情況，把資金做最合適的調度，因此被稱為「不夜銀行」。