You could try pulling up the patents: they usually go into a fair amount of detail. I'd give you a link but I've deleted all my "evil" links which includes patents. (A respected patent attorney claims that about 95% of technology patents should never have been awarded. That doesn't apply to Apple of course. Sorry I mean M$'s. )
But you can start at
http://www.uspto.gov and search.
Gonna port it to Mac OS X?
Someone may have got there first, ie, Apple, if you believe what's at the very bottom of this long page
http://perso.club-internet.fr/jctrot...tory.html#Sys2
(last table block, under "Mac™ OS and Apple™ development (with reservations)")
I'm thinking tablet form factor iBook with stylus... Drool.