Like Hal said, you will need a PCMCIA ethernet adapter which will attach to an external cable modem, usually supplied by the cable company. I'm spoiled and don't think I could ever go back to dial up again. It is $39.95 well spent. I got rid of an extra phone line and my old ISP and the speed is unbelievable especially with the tweak from speedguide.net. Downloads that took up to an hour before with 56K are now done in a couple of minutes.
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Take Smoke's advice as fact if it works and fiction if it don't!!!