function GetCaretPosition(var APoint: TPoint): Boolean;
 var w: HWND;
  aID, mID: DWORD;
 begin
  Result:= False;
  w:= GetForegroundWindow;
  if w <> 0 then
  begin
  aID:= GetWindowThreadProcessId(w, nil);
  mID:= GetCurrentThreadid;
  if aID <> mID then
  begin
  if AttachThreadInput(mID, aID, True) then
  begin
  w:= GetFocus;
  if w <> 0 then
  begin
  Result:= GetCaretPos(APoint);
  Windows.ClientToScreen(w, APoint);
  end;
  AttachThreadInput(mID, aID, False);
  end;
  end;
  end;
 end;

 //Small demo: set cursor to active caret position
procedure TForm1.Timer1Timer(Sender: TObject);
 var
  Pt: TPoint;
 begin
  if GetCaretPosition(Pt) then
  begin
  ListBox1.Items.Add(Format('Caret position is %d %d', [Pt.x, Pt.y]));
  SetCursorPos(Pt.X, Pt.Y);
  end;
 end;