Video tutorials for Definitive Human and Head and Neck Find here all the information you need to use the Definitive Human and the Head and Neck software. How to install Definitive Human and Head and Neck This video explains how to install and licence both the Definitive Human and the Head and Neck software. It is important to know that once you register your key, it will work with both applications so you won’t need to register the software again. Also, once you register the software, you can install future updates without the need of registering your software again. How to use the main features of Definitive Human This video shows the main features of the Definitive Human software. Most of these are exactly the same in the Head and Neck, we will upload more tutorial videos explaining the differences and extra features that you can find on both applications.