Delta PE (Delta Preinstallation Environment) is a backend of sorts, used in newer versions of Delta for a graphical installation. Without it, setup would be more boring and wouldn't even support a mouse! Delta PE is so small it can fit on the CD/DVD/USB used for installation with no compromise. It's also like a DOS (Disk Operating System) because it can have a graphical shell. That's basically what the setups are; graphical shells for Delta PE. A version of Delta PE may be modified if needed for a specific Delta OS. It is also possible to create your own Delta PE graphical shell by remixing this project. Instructions are in Delta PE Sprite