由于在一个窗口内可以使用多个菜单，因此GLUT通过为菜单提供一个整数标识符的方式实现多窗口的管理。这个整数标识符是在菜单创建时由系统从1开始顺序分配的，通常可以用下面的语句获得这个标识符：-Since a window can use more than one menu, so GLUT by an integer identifier for the menu offers a way to achieve multi-window management. The integer identifier is created by the system in the menu in sequence, starting from a distribution can usually be obtained with the following statement this identifier: