Hi @saj1984, thanks for getting in touch. The first 3 files in your list (Tobii.EyeX.Client.dll, Tobii.Interaction.Model.dll,Tobii.Interaction.Net.dll) are the libraries required by the Tobii Interaction Library API (https://developer.tobii.com/product-integration/interaction-library/getting-started/) whilst the remaining files are those that are produced by the user of this Github project. IT seems that the project is designed to fulfill your needs to eyetrack using Javascipt however, please be aware this is third party code and not something Tobii can officially support. If you are having trouble using the users’ code, then we would recommend you reach on the Github issues pages for an answer to your query.