Автор: http://www.swissdelphicenter.ch

procedure TForm1.Button1Click(Sender: TObject);
 begin
   Label1.Caption := Format('Caret blink time is: %d ms', [GetCaretBlinkTime]);
 end;


 procedure TForm1.Button2Click(Sender: TObject);
 begin
   // Set caret blink time to 2000ms 
  SetCaretBlinkTime(2000);
 end;