光标首先定位在右窗口最下面一行的行首（15，50），如果从键盘输入字符，则显示在右窗口，同时也显示在下窗口的最下面一行。若需要将字符显示于左窗口，则先按下左键，接着再从键盘输入字符，字符就会从左窗口的最下行开始显示，同时下窗口也显示左窗口的内容。当一行字符显示满后，窗口自动向上卷动一行，输入字符继续显示于最低一行，窗口最高一行向上卷动后消失。-First locate the cursor in the right window, the first line of the bottom line (15.50), if the input character from the keyboard is displayed in the right window, the next window also shows the bottom line. If you need the character shown in the left window, you first press the left button, then re-enter the characters from the keyboard, the character will start from the left window to display the most down, while the left under the window also displays the contents of the window. When a line full of character display, the window automatically scroll up one line, enter the characters continue to show the lowest line, top line scroll up the window disappears.