DVD Video Programming

I'm interested in creating programs that would run on a DVD movie, but I can't find anything remotely useful.

I found DVDAuthor, but I don't think it really suits my purposes. I need more functionality than just setting subtitles and creating menus. I want to run actual programs... like using functions, setting variables, and all that jazz. Is this feasible? It seems like it should be, since interactive games like Scene It exist, but who am I to say. I can't find a god damn bit of information on this.

If anybody knows of any tutorials or libraries on how to do more extensive programming, it would be greatly appreciated if you would share. :)

I'm always open to learning new languages.

>>14
Registers ARE memory, except they're usually so little memory that you can't do any real programming in them.
You're forgetting that the DVD instruction set was made for making DVD menus, not actual programs.