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 regardless of the changes that it will make to the software environment on your server, and you will be able to both access and modify any file, including system files, and modify various settings. This can be done by connecting to the server as a root user that has full privileges to do the aforementioned things as well as to make other users, which includes users that also have full privileges. This particular can be established with a web-based graphical interface or a Secure Shell console. For security reasons, it is recommended that you make a separate 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 required by a script-driven app that you wish to run.