If you have root-level access to a server, it means 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 environment on your server, and you are able to both access and customize any file, which includes 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 and to create other users, which includes users that also have full privileges. The connection can be established through a web-based graphical interface or a Secure Shell console. For security reasons, it is recommended that you create a separate user for your everyday work and employ the root user only when you have to customize the server or to install software which may be required by a script-driven app that you want to run.