1. Click on Airport symbol at top of screen and choose "Open network preferences" (you can also get there via System Preferences" icon in Dock).
2. Click on down arrow next to "Location" and choose "Edit locations."
3. Click on "+" and type in name (I used Home).
4. Click on "AirPort" in the box at the left to make sure you are configuring the right connection. I stayed with default configuration, typed in the name and password for my WiFi network.
5. Click on Advanced.
6. Click the AirPort tab at top; add network if necessary and the security info.
7. Make sure you are connected to the wireless network.
Click on WINS at top.
8. NetBIOS name should be filled in and gray (mine showed "iMac").
Click drop-down menu on Workgroup and you should see your Windows workgroup name.
9. Click on Plus key and enter the IP address for the Windows machine you want. (You can get this on your Windows machine by going to start, run, type "cmd" and press enter. This brings up a DOS window. Type ipconfig and press Enter).
Entering the IP address in addition to the workgroup appears to be essential to be able to see shared printers attached to the XP machine.
