Slax Xorg implements the X display protocol and provides windowing on the display. It contains variety of drivers for graphics cards and input devices like keyboards, touchpads and mice. It also adds support for many image formats like JPEG, PNG and GIF. Furthermore, it includes libraries like SDL or GTK to run most of the graphical applications.
This module is already included in official Slax release, so you don't need to download it separately. However, you may need to add it while using the 'build Slax' feature of this website.