That's a patent application, which was rejected earlier this year in light of a prior IBM patent (http://www.google.com/patents/US5463725 http://www.google.com/

That's a patent application, which was rejected earlier this year in light of a prior IBM patent (http://www.google.com/patents/US5463725 http://www.google.com/patents/US5463725) and another of Apple's (http://www.google.com/patents/US7469381 http://www.google.com/patents/US7469381).