Wassup with the FN key?

Check out part of my MSN conversation with Uncle Anthony...

*catacomb is Uncle Anthony
[Obviously]*XiaNg dUi nI sHuO meRry X'mAs.. sHen biAn qUe mEi yOu zUi aI dE Ni.... is me.

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XiaNg dUi nI sHuO meRry X'mAs.. sHen biAn qUe mEi yOu zUi aI dE Ni.... says:
do you know how to use the numberpad on the keyboard of a notebook?

catacomb says:
hmm yup

XiaNg dUi nI sHuO meRry X'mAs.. sHen biAn qUe mEi yOu zUi aI dE Ni.... says:
....... i thought u would tell me how to without me asking you.. haha

XiaNg dUi nI sHuO meRry X'mAs.. sHen biAn qUe mEi yOu zUi aI dE Ni.... says:
so would u tell me how i can use the numberpad?

catacomb says:
haha press the FN button

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How silly.