怎么设计UDP服务器

如何设计UDP服务器啊
TCP服务器我知道怎么弄，总之就是连接上以后通信，但是UDP不需要连接，那怎么UDP处理成百上前的服务啊？

[解决办法]
udp srv:
socket();
bind(port);
while(1)
{
if(recvConnectReQ)
{
AfxBeginThread(taskThd);
}
if(StopEvent)
break;
}
--------------
taskThd:
socket();
bind(a unused port);
send msg to the client socket: I am Here, u can cantact with me
begin the task;
closesocket();
--------------
udp client:
socket();
bind();
sendConnectReq;
if recved the I am Here msg, transmit data to that socket!
task over;