(1) A tablet computer environment from Microsoft that is based on an enhanced version of Windows XP. Designed to function more like a portable writing tablet than previous tablet-based computers, it includes handwriting recognition as well as the ability to retain handwritten words and annotations without turning them into computer text. This latter ability is known as "rich digital ink," because the inking (writing, drawing, scribbling) is stored as a graphic after algorithms smooth out rough edges. See touch screen and Ultra-Mobile PC.

(2) (tablet PC) Any tablet-based computer, including those prior to Windows XP-based models. See tablet computer.