The Hackday Toolbox is a collection of demo code that should get you going when you are competing in a hackathon or hackday. It was compiled to avoid having to explain the same problems over and over again and instead to give you a simple example to start from.
This is not meant to be a document to surf but instead to try out and look at the source code. All the client-side examples have all the code in-line and you can start altering it to your needs. The PHP examples you need to look at the source in the editor of your choice.