What is compiz?
In a nutshell, Compiz is a compositing manager, which means that it enhances the overall user interaction by adding fancy effects to your windows, from drop shadows to awesome desktop effects like the Desktop Cube or the Expo view.
Compiz can also be a window manager, which means that it is the software between you and your desktop apps. It enables you to move or resize windows, to switch workspaces, to switch windows easily (using alt-tab or so), and so on.
To avoid possible headaches while you try to install compiz on a new machine (being it an Arch Linux OS or not) this script will help you in the first step and most important step, is your hardware capable of running compiz?
You can download the script from HERE