I access the internet via Comcast and a Motorola cable modem connected to my desktop via a network cable (i.e., not USB). That works fine.
I have a wireless connection between my desktop and my Dell notebook via a D-Link DWL-G122 802.11g Wireless USB Adapter. The notebook has built-in wireless networking. I can exchange files, etc., between the desktop and the notebook, so that works fine too.
However, I haven't figured out how to access the internet from my notebook.