Prism documentation

[Nir Lisker]

Hi Kevin,

Since Prism is only used internally it has no publicly available
documentation (none that I could fine). I was wondering if there are any
design materials or writeups that exist internally and can be released for
development purpose.

Specifically, I was looking at the d3d pipeline was was baffled by the use
of self-defined classes (like D3DLight) when d3d already offers classes
with these classes (D3DLight9).

- Nir