[SDL] SDL limitations and window management

[Andrew Straw]

> AFAIK you can't have two windows in SDL, and it shouldn't be changed 
> (how could
> you imagine 2 windows on framebuffer or svgalib?).

I think it would be great to allow the _option_ of opening more than 1 
SDL/OpenGL window and also the ability to position them on multiple 
displays.  I know some of this sort of functionality can be achieved by 
opening a single, display-spanning window, but there are situations 
where this will not work or will not be ideal. I gather that this won't 
be happening for SDL 1.2, though.