When you have root-level access to a server, this means that you will have full control of it. In other words, you can set up any server-side application irrespective of the changes that it will make to the software environment on the server, and you're able to both access and modify any file, which includes system files, and change any settings. This can be done by connecting to the server as a root user that has full privileges to do the aforementioned things and to make other users, including users that also have full privileges. This connection can be established through a web-based graphical interface or a Secure Shell console. For safety reasons, it is recommended that you create a different user for your everyday work and use the root user only when you have to modify the server or to set up software that may be required by some script-driven application that you want to run.