[SDL] [SDL 1.3] How to get the surface after CreateWindow ?

[Champetre]

Hello,

I try to use SDL 1.3 (rev 4100) for multiwindows. I can create windowS
and process events for each window, but I don't know how I can get the
SDL_Surface* of the window.

Someone knows howto draw in a SDL_Window ?

Thank you very much

Champetre