- 1. A system condition that results from an external event; system control passes to a service routine.; 由外部事件产生的系统状态;使系统控制转给服务程序。 2. The address of the entry point in a routine that is always executed, for example, whenever a communications link is set up or whenever a particular error condition occurs. | 要执行的例程中入口点的地址。例如,当通信线建立时,或特定错误条件出现时,系统就 总是要把控制转入该入口点。
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