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procedure MakeScreenShot(const ATarget: TBitmap);
var
  DesktopDC: HDC;
begin
  DesktopDC := CreateDC('DISPLAY', nil, nil, nil);
  try
    ATarget.PixelFormat := pfDevice;
    ATarget.Width := Screen.Width;
    ATarget.Height := Screen.Height;
  
    BitBlt(ATarget.Canvas.Handle, 0, 0, Screen.Width, Screen.Height, DesktopDC, 0, 0, SRCCOPY);
  finally
    DeleteDC(DesktopDC);
  end;
end;