In systems with time sharing, an exchange between a terminal and another device that accomplishes a particular action or result; for example, the entry of a customer's deposit and the updating of the customer's balance.在分时系统中,终端和其它设备进行一次数据交换,从而完成一个特定的动作或产生一个特定的结果。例如,输入客户的存款金额并修改客户的余额。