func main() {
  log.SetFlags(0)
  registryAddr := "http://localhost:9999/gingle/registry"

  addr := make(chan string)
  go StartClient(addr)
  StartServer(addr, registryAddr)

  ch1 := make(chan string)
  ch2 := make(chan string)
  go StartServer(ch1, registryAddr)
  go StartServer(ch2, registryAddr)
  StartXClientByPeerToPeer(registryAddr)
  StartXClientByBroadcast(registryAddr)
}