Nice try - but the answer is to start the WZC service. When upgrading from Win2k to WinXP, the WZC is not enabled by default.
Keypoint: Whenever the "Wireless" tab is missing from the wirless NIC properites panel, this is an indication that the WZC service is not running (is everyone listening?). Once the WZC service was started, the the wireless tab showed up in teh NIC properties panel which then allows for SSID and encryption key settings.
If you read the "UPGRADE.TXT" file that comes with SP21123, you will find that in step "11) At this point, if your module's firmware needs to be upgraded, a dialog will appear telling you that your firmware needs to be upgraded." This did not happen, so no firmware upgrade was needed.