Hardware & DIY, Operating Systems, Handheld & Mobile Devices, Mathematics 

The popularity of "palmtop" computing devices is soaring thanks in part to the popularity of the Handspring Visor line of expandable handhelds. Sales of new products such as the Visor Prism, Visor Platinum, and Visor Deluxe outstrip those of cell phones and personal computers in some corners of the country. Handspring Visor: Visual QuickStart Guide introduces the complete Visor line, showing readers how to use the operating system, basic modules (address book, date book, memo pad, to-do list), and advanced features.The book covers every feature and facet of Handspring's devices from entering text and sketches, to managing schedules, using databases, spreadsheets, personal finance programs and games. It also addresses the Springboard modules that convert Visors into cell phones, GPS systems, pagers, and MP3 audio players. - from Amzon