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Server: TIdTCPServer;

procedure TForm1.FormActivate(Sender: TObject);
begin
  Server.active := true;
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
  Server.active := false;
end;

procedure TForm1.ServerExecute(AThread: TIdPeerThread);
var
  MSG: String;
begin
  MSG := AThread.Connection.ReadLn();
  Memo1.Lines.Add(MSG);
end;                    

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$fp = fsockopen("123.123.123.123", 6666, $errno, $errstr, 30);
if (!$fp) {
   echo "$errstr ($errno)";
} else {
   fwrite($fp, "HEYHO");
   while (!feof($fp)) echo fgets($fp, 128);
   fclose($fp);
}