- Check the FAQ on wirelessdriver.sourceforge.net to find a PC Card for the PowerBook
- Get an 802.11b WiFi certified base station and configure it to share your Internet connection --or-- put an Airport card in an available Internet-wired desktop and configure it to share the connection using the Airport card (in System Preferences under Sharing in the Internet tab).
- Install the driver from the sourceforge site on the PowerBook and install the PC Card
- Configure the PowerBook to connect via Airport using DHCP
[Editor's note: I haven't tested these instructions myself ... we've run other hints pointing at the sourceforge project site, but not with a set of instructions on how to use it.]

