This document provides an overview of PARALLAX, introducing its usage, key functionalities and underlying principles. It includes background information on the numerical methods and algorithms used within the library. Several example codes are provided to demonstrate typical use cases of the library. Please note that this is not a comprehensive reference for the library’s interfaces; for a detailed description, you will need to refer to the source code itself. Additionally, some features may not be fully covered here, and, as development is ongoing, the documentation may differ from the current state of the source code.