This document provides a guide for performing a graphical user interface (GUI) installation of CentOS/RedHat on a Xen server, allowing users to customize partitions and manage packages. It outlines the prerequisites such as access to Xenserver and Xencenter, and the steps to initiate the GUI installation including selecting the template, installation media, and configuring network settings. The process culminates in accessing the GUI install screen via a VNC viewer after retrieving the installation image from the specified URL.