procedure TMainForm.FormCreate(Sender: TObject);
var
  Init: TWSAData;
  SockOpt: BOOL;
  Sock: TSocket;
  Target: TSockAddrIn;
begin
  WSAStartup($101,Init);
  Sock:=Socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
  SockOpt:=TRUE;
  SetSockOpt(Sock,SOL_SOCKET,SO_BROADCAST, PChar(@SockOpt),SizeOf(SockOpt)) ;
  Target.sin_port:=htons(8167); //номер порта
  Target.sin_addr.S_addr:=INADDR_BROADCAST;
  Target.sa_family:=AF_INET;
  SendTo(Sock,Data,DataBytes,0,Target,SizeOf(Target));
  WSACleanup;
end;