Annotating Digital Files Of A Host Computer Using Networked Tablet Computers

A data processing system, comprising:

• a central processing unit;
• a stroke-sensitive display coupled to the central processing unit;
• a host computer interface coupled to the central processing unit and configured to couple to a host computer;
• memory coupled to the central processing unit and storing a plurality of sequences of program instructions which when executed by the central processing unit cause the central processing unit to perform:
• receiving, at the stroke-sensitive display, image data representing a selected portion of a common display file that is stored on an administrator computer;
• displaying the image data on the stroke-sensitive display;
• receiving user input from the stroke-sensitive display and representing handwritten strokes;
• transmitting the user input to the administrator computer;
• receiving, from the administrator computer, second image data representing strokes that other users have applied to the same image data using other tablets that are coupled to the administrator computer over a network;
• and
• displaying, on the stroke-sensitive display, the second image data.