参与画板的每个人可以选择一种颜色画笔，然后在公共画板上做图。程序通过邮件槽共享鼠标信息，实现不同电脑之间的简易通信。- Everyone involved in the drawing board can choose a color brush, and then make plans on the drawing board in public. Program sharing information through mail slot mouse to achieve simple c