The AirPort Base Station Software file is the software for the Base Station.
AirPort Admin Utility Folder
This folder contains the software and instructions on how one might configure an AirPort Base Station with a non-AirPort-Capable Computer.
For the contents of the Installation Instructions see article 58584: "AirPort: Configuring a Base Station With a non-AirPort-Capable Computer".
Note: Wireless Internet access requires an Internet service provider (fees may apply) and AirPort (or AirPort-compatible) wireless Ethernet card and base station. Some ISPs are not compatible with AirPort. For more information, see technical document 106590: "AirPort: Requirements for Wireless Internet Access"