if ExecuteJavascript('document.readyState', true) = 'complete' then
  begin
    if ExecuteJavascript('window.TMSWEBCoreClientIdentifier', true) = 'unknown' then
      FInitialized := True;
  end;

initialization
begin
  HandShakeScript := TJSHTMLScriptElement(document.createElement('script'));
  HandShakeScript.id := 'HandShakeScript';
  HandShakeScript.type_ := 'text/javascript';
  HandShakeScript.innerHTML :=
  'var TMSWEBCoreClientIdentifier = "unknown";'+#13#10+
  'function HandShake(cid){'+#13#10+
  '  TMSWEBCoreClientIdentifier = cid;'+#13#10+
  '}';
  document.body.appendChild(HandShakeScript);

  Application := TApplication.Create(nil);
end;

procedure TTMSFNCCustomWebCoreClientBrowser.PerformHandshake;
var
  c: string;
begin
  {$IFDEF MSWINDOWS}
  c := 'windows';
  {$ENDIF}
  {$IFDEF MACOS}
  {$IFDEF IOS}
  c := 'ios';
  {$ENDIF}
  {$IFNDEF IOS}
  c := 'macos';
  {$ENDIF}
  {$ENDIF}
  {$IFDEF ANDROID}
  c := 'android';
  {$ENDIF}
  ExecuteJavascript('HandShake("'+c+'");');
end;

procedure TForm1.ClientSendButtonClick(Sender: TObject);
var
  c: TJSONObject;
begin
  c := TJSONObject.Create;
  c.AddPair('Message From Client', 'Hello World !');
  w.Send(c);
  c.Free;
end;

procedure TForm1.WebButton1Click(Sender: TObject);
var
  o: TJSONObject;
  js: TJSON;
  s: string;
begin
  js := TJSON.Create;
  s := '{"Message From TMS WEB Core Application":"'Hello World !"}';
  o := js.parse(s);
  w.Send(o);
  o.Free;
end;