I happen to have an unused ZyXel ZyAir G-200 USB Adapter. This Adapter is the standalone type that can also function as an Access Point, not a dongle-type device.
The box indicates it's for PC's running XP, etc. and there are no OSX drivers provided. I'm wondering if MacOSX would detect this device and access the wireless signal from my router to provide internet access for an early iMacG3 that has a USB port but no wireless card.
Any insights?