基于IP多播的组讨论的软件。用户运行之后即自动加入会议组，发送消息窗口下的组合框列出在线成员，可选定单选按键 面向组 。-Based on IP Multicast group discussion software. User to run automatically after the group joined the meeting, send the message window of the combo box under the list of members online to s