1. A system for use by a plurality of users working on a common project that has an associated display, the system comprising: at least two display computing appliances each comprising local display logic and a local display apparatus, each of the display computing appliances providing a local display presentation to a respective associated user; layer storage and control logic comprising memory structured as at least two separate respective data layers of data storage for associative storage of data mapped by data layer to be associated with the respective user providing the respective input; wherein each of the local display apparatus is responsive to the layer storage and control logic, for providing a respective said local display presentation for viewing by each said respective one of the at least two users, the respective said local display presentation providing at least a common portion of the display presentation for concurrently viewing by the at least two users, at each of the respective said display computing appliances; input logic providing respective user data representative of respective user input, by each respective one of the at least two users, of respective user data, provided responsive to the respective user input by the respective one of the at least two users while the respective one of the at least two users is concurrently viewing the respective said display presentation; wherein for each said respective user, there is a separate respective data layer of data storage for storing respective user data associated with the respective user; wherein each of the local display apparatus is further responsive to the layer storage and control logic, for providing a respective local display presentation to the associated said respective one of the at least two users; and wherein the respective local display presentation is responsive to the respective user input of respective user data representative of respective input as provided by the respective one of the at least two users, as provided and input by the respective one of the at least two users while the respective local display presentation that is provided to that said respective one of the at least two users is comprised of at least the common portion of the display presentation that is provided for concurrent viewing by the at least two users, at each of the respective said local display computing appliances.