Red Hat Linux 6.1 and 6.2 include four different classes, or type of installation. They are:

The first three classes GNOME Workstation, KDE Workstation, and Server give you the option of simplifying the installation process with a significant loss of configuration flexibility that we don't want to lose. For this reason we highly recommend Custom installation, as this allows you to choose what services are added and how the system is partitioned.The idea is to load the minimum number of packages, while maintaining maximum efficiency. The less software that resides on the box, the fewer potential security exploits or holes may appear.Select Custom and click Next