When you have root-level access to a server, it indicates that you will have full control over it. That is to say, you'll be able set up any server-side application irrespective of 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 modify any settings. You can do this by connecting to the server as a root user who has full privileges to do all these things as well as to generate other users, which includes users that also have full privileges. This particular can be established through a web-based graphical interface or a Secure Shell console. For security reasons, it is recommended that you create another user for your everyday work and employ the root user only when you have to modify the server or to install software which may be needed by a script-driven app that you want to run.