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You use the adapter to connect directly into the cable box, with an ethernet cable, then buy your dad a laptop wireless pick-up card, and that should be it.

EDIT: The ethernet cable going to the cable internet box, should be in the "Internet" port of the router.

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Solid advice.  If everything goes wrong dont pay some joker to do it for you (Best Buy, PC World etc) Get a FAQ on the web.  Or even ask a smart friend!

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Now, I suppose this is the time for me to say something
profound.... Nothing comes to mind, let's do it.