The title to this question is very dodgy until you read on, 10 fingers. that explains it, thats not possible for what im thinkin!!! Excuse my dirty mind :-)
I use all ten fingers if am sitting at the desk (55-60 wpm), on the bed with the laptop I use three fingers on my right hand. And it's amazing how quickly I can do it with only three fingers!
Ahahaha JJ! the lappy is usually on the bed on my right side, and I usually sit with five or six pillows propping up my back. the other hand is free to do whatever... ;-)