When you have root-level access to a hosting server, this means that you will have full control of it. That is to say, you'll be able install any server-side app no matter what the changes that it will make to the software setting on your server, and you'll be able to both access and customize any kind of file, including system files, and change various settings. This can be done by connecting to the server as a root user who has full privileges to do all these things as well as to create other users, which includes users who also have full privileges. The connection can be established with a web-based graphical interface or a Secure Shell console. For security reasons, it is recommended that you make one more user for your everyday work and employ the root user only when you have to customize the server or to set up software that may be needed by some script-driven app that you wish to run.