以Visual Basic为开发工具，使用支持来电显示的Modem，实现一个来电显示的客户管理系统，该系统能够根据来点马上得到客户的详细资料和业务往来记录。-to Visual Basic development tool to support the use of the CND Modem, CND achieve a client management system, Under the system can be immediately point to the detailed cus