TechWeb - The first Mac tablet computer is set to be unveiled at MacWorld Expo next week in San Francisco. The ModBook, a high-end slate-style notebook computer, is being developed by a cooperative effort between hardware manufacturer Axiotron Inc. and Other World Computing, a Mac product manufacturer and reseller. The Axiotron ModBook features WACOM Penabled hardware for pen input and is fully compatible with Apple's Inkwell, a Mac OS X Tiger feature that provides system-level handwriting and gesture recognition for Mac applications, the company said. Axiotron said users will be able to draw and write directly on the screen. They are aiming the product at professionals, students, and artists. The ModBook also is the only portable Mac system that features an optional built-in Global Positioning System, the company said.