In arpanet , a background program in the interface message processor ( imp . these programs include the statistics generation routines , the debug facilities , and the imp console teletype handler 在目的代碼中安插的斷點,使得執行在適當的時間和位置上轉向查錯程序。
百科解釋
The Interface Message Processor (IMP) was the packet-switching node used to interconnect participant networks to the ARPANET from the late 1960s to 1989. It was the first generation of gateways, which are known today as routers.