CUDA 5 - OpenGL interop

Accelerated Computing CUDA CUDA Programming and Performance
1

Greetings,

Where can I find the CUDA-OpenGL interop packages for CUDA 5?
The presentation I am following makes references to
cudagl.h
cuda_gl_interop.h
as well as function calls such as:
cuGLCtxCreate(), cuGLRegisterBufferObject(), etc.