// after receive Telephony and modify database regrading tables. 
// Broadcast Message and notify orther Client Computer to re-open regrading tables.
// This Example use port 7 (echo service) for TNMUDP LocalPort & RemotePort Properties. 
procedure TForm1.Button1Click(Sender: TObject);
var s: array[1..6] of char;
begin
   NMUDP1.RemoteHost := 'x.x.x.255'; // Broadcast on TCP/IP x.x.x Network domain
   s := 'ReOpen';
   NMUDP1.SendBuffer(s,sizeof(s));
end;    // ReOpen Data when Received Message.
procedure TForm1.NMUDP1DataReceived(Sender: TComponent;
  NumberBytes: Integer; FromIP: String; Port: Integer);
var
  C: array [1..6] of Char;
  I: Integer;
begin
  if NumberBytes<=6 then begin
     NMUDP1.ReadBuffer(C, I);
     if C='ReOpen' then begin
        // ReOpen TQuery ...
     end;
  end;
end;