If you have root-level access to a server, it indicates that you will have full control over it. In other words, you can set up any server-side application whatever the changes that it will make to the software setting on your server, and you are able to both access and change any 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 perform the aforementioned things and to generate other users, which includes users who also have full privileges. The connection can be established using a web-based graphical interface or a Secure Shell console. For safety reasons, it's recommended that you create one more user for your daily work and use the root user only when you need to customize the server or to install software which may be required by a script-driven application that you would like to run.