在屏幕上开出三个窗口：











用“<-”和“->”键选择左窗口或右窗口为当前活动窗口，从键盘输入字符，

字符就会从当前活动窗口的最下行开始显示，同时也在下窗口显示。当一行字符显

示满后（左右窗口一行显示20个字符，下窗口显示50个字符），窗口自动向上卷

动一行，输入的字符仍显示于最低一行，窗口最高一行向上卷动后消失,按ESC键

程序运行结束。

-Use ""- "and"- "" key to select the left or right window, the window for the current active window, from the keyboard input characters,

              Characters from the current active window will be the most down is beginning to show, but also in the next window appears. When the line of remarkable characters

              Show full after (a line around the window displays 20 characters, the next window displays 50 characters), the window auto-up volume

              Action line, enter the characters still show the lowest line, the highest line of the window disappear after scrolling up, press ESC key to

End of the program is running.