How can i save a satellite remote control buttons on a micro-controller?

wheneever a satelite or tv remote control is pushed down and a button is selected, a specific frequency is created, how can i save a binary number relative to the frequency created, on a microcontroller?How can i save a satellite remote control buttons on a micro-controller?
Why waste your time building your own when you can buy this :





http://www.buy.com/retail/product.asp?sk鈥?/a>





It's IR and RF....and certainly cheaper than building your own.

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