一些任務是間歇性的，但他們需求知道操作的終狀況。這是一種典型的操作。要記住的是，什么構成一個方式?程序是怎樣分配使得它滿足兩個要求?運用ALT指令能處理一種簡略的這個/那個的狀況。
這種編程方式在很多狀況中能夠見到。不過經常地，運用都略有不同。在某一場合中，一臺機器或許被起動;在另一場合中，一個排氣扇或許在循環(huán)與排氣間轉換。不同狀況下，問題的初始表現(xiàn)并不能讓人想起相同的解決方法。

Some tasks are intermittent, but they need to know the final status of the operation. This is a typical operation. Remember, what constitutes a way? How is the program allocated so that it meets two requirements? Using ALT instruction can deal with a simple situation of this / that.
This programming method can be seen in many situations. But often, the application is slightly different. On a certain occasion, a machine may be started; In another case, an exhaust fan may switch between circulation and exhaust. In different situations, the initial performance of the problem does not remind people of the same solution.