projective texture

OpenGL OpenGL: Basic Coding
1

I’m looking for a good tutorial about projective texture.
I need to understand how work texture matrix.

Thanks.

Ale.

2

both nVidia and ATI have loads of demos and source code, and projective texturing is covered, see
http://developer.nvidia.com/page/home

and/or
http://www.ati.com/developer/index.html

(no personal preference is implied by the order of the hyperlinks )