The following is from the download page:

Description:  Notebook System Software (NSS) is a utility that provides critical updates and patches for your operating system. Install the NSS program to gain support for Dell 3.5-inch USB floppy drives, Intel Pentium-M processors, CD-ROM/CD-RW/DVD drives, Infrared (IR) communications, and USB devices. NSS is necessary for correct operation of your Dell portable computer, including the Dell D/Bay, D/Dock, D/Port, and D/View family of docking devices. NSS automatically detects your computer and operating system and installs the updates appropriate for your configuration.

As are the following:

This file contains a compressed (or zipped) set of files. Download the file to a folder on your hard drive, and then run (double-click) it to unzip the set of files. Follow the instructions to complete the installation.

and

Notebook System Software is critical for the correct operation of USB devices, including the Dell D/Bay, D/Dock, D/Port, and D/View.

Steve