But confirmation doesn't solve this problem. If the user was confused when he first gave whatever command triggered the confirmation box, he'll be even more confused when he sees it.
Instead of asking in advance with a confirmation dialog box, on those rare occasions when the program's actions were out of turn, let the user issue the Stop-and-Undo command.
的情况下，当程序行为不合时宜时，让用户发起停止并撤销的命令，取代预先用确认对话框提问的方式。
3
Verify that the vehicle horn chirps one time to signal the RAP module confirmation of the command.