Problems with many windows

So, I created SDL window, but I have some question:

  1. Why there is no difference between creating SDL window
    with and without seting SDL_WINDOWID=Form1->Handle?
  2. When application runed showed both SDL window, and
    form window. And form window handle events, but
    SDL window - no. Why?

I use SDL 1.0.8, C++ Builder 4.0, Windows 98, DX7.0