Alright. I've been trying to remember the name of this book for quite some time now. I read it about fourteen years ago. It was about a boy and a girl who somehow (I forget how) get sucked into a computerized world. They have a sort of spellbook along with them and they have to use it to write code. Or something. Haha. Whenever I try to remember details I receive an image of a girl and a boy kneeling on a ground of green grid lines looking at a book. Ring any bells?