1. What is a Tablet PC? - A Tablet PC is a PC that has a touch screen. Most of the Tablet PCs will not have built-in keyboards however users will be able to plug in keyboards if they want to.  The main method of input is handwriting recognition similar to Transcriber on the Pocket PC.  Also, the Tablet PC is unique in it's support for ink notes as well. 

2. What Operating System does a Tablet PC use? - The Tablet PCs use Windows XP Professional. They also have additional software installed for handwriting recognition and ink notes.  I anticipate that existing applications that are compatible with Windows XP will run on the tablet PC, however they will not support ink.

3. How does the Tablet PC handwriting Recognition work? - The handwriting recognition on the Tablet PC works based on your natural writing.  It accepts printing and handwriting.  The operating system actually stores the handwriting as a graphic and the converted text in the notepad application.  So you can go back and forth between the handwriting and the converted text for nuances that the recognizer may have missed.  Also, the handwriting recognition can be done after you have entered your notes in.   It does not have to be done real time.

4. What processor does the Tablet PC use? - The original Tablet PC that Bill Gates presented at Fall Comdex 2000 used a Transmeta Crusoe 600 MHz CPU.   The OEMs that have announced plans to offer the Tablet PC are also using Intel Pentium III Mobile and the Transmeta Crusoe 800 MHz CPU as well.

5. What size is the Tablet PC? - The prototype Tablet PC that I saw was about 9" x 12" x 1".  I'm sure we are going to see many different size Tablet PCs from manufacturers.