程序不断的监视打开的所有的窗口，并查看其tittle是否在程序的列表中。如果匹配，那么程序将向那个窗口发送一个关闭的消息，来杀掉这个窗口。-constant surveillance procedures to open all the windows and check whether their tittle of the procedure list. If matching, the process will send a window that closed, it has to kill this window.