1. A system condition that results from an external event; system control passes to a service routine.; 由外部事件產(chǎn)生的系統(tǒng)狀態(tài);使系統(tǒng)控制轉(zhuǎn)給服務(wù)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. | 要執(zhí)行的例程中入口點的地址。例如,當通信線建立時,或特定錯誤條件出現(xiàn)時,系統(tǒng)就 總是要把控制轉(zhuǎn)入該入口點。