參考文章
NetConnection成功後的設定
var groupspec:GroupSpecifier = new GroupSpecifier("myGroup/groupOne");     groupspec.postingEnabled = true;     groupspec.ipMulticastMemberUpdatesEnabled = true;     groupspec.addIPMulticastAddress("225.225.0.1:30303");      group = new NetGroup(nc,groupspec.groupspecWithAuthorizations());     group.addEventListener(NetStatusEvent.NET_STATUS,netStatus);
Event 的處理
要加上
case "NetGroup.Connect.Success":       connected = true;       break;
case "NetGroup.Posting.Notify":       receiveMessage(event.info.message)       break;
接受的處理
private function sendMessage(txt:String):void
{
     var message:Object = new Object();     message.text = txt;
     message.sender =       group.convertPeerIDToGroupAddress(nc.nearID);
     message.userName = txtUser.text;          group.post(message);
     receiveMessage(message);
    
 }
private function receiveMessage(message:object):void {
   trace(message.userName+": "+message.text);
}