None of that is even code needed to move the little arrow around the screen. The driver is built into the USB stack, all the rendering and movement of the mouse is in other parts of the OS.

It's all help files specific for your mouse, likely with pictures and diagrams of the buttons. Along with potentially some extra mouse cursors you will likely never use, and software to remap buttons. At least thats what I remember being in the Intellipoint installs.