The file ipw3945.ucode provided in this package is required to be
present on your system in order for the Intel PRO/Wireless 3945ABG
Network Connection Adapater driver for Linux (ipw3945) to be able to
operate on your system.

On adapter initialization, and at varying times during the uptime of
the adapter, the microcode is loaded into the RAM on the network
adapter. The microcode provides the low level MAC features including
radio control and high precision timing events (backoff, transmit,
etc.) while also providing varying levels of packet filtering which
can be used to keep the host from having to handle packets that are
not of interest given the current operating mode of the device.