11. A method for printing and interacting with a document, said method comprising the steps of: receiving, in a computer system, a request for printing said document, said document containing visible information; allocating a document identity to said document; determining coded data for said document, said coded data encoding a plurality of locations on said document and identifying said document identity; sending print data to a printer; printing the document so that the printed document includes said visible information superimposed with said coded data, said visible information and said coded data being printed at the same time by a printer connected to the computer system; interacting with the printed document using an optically imaging pen; imaging at least some of the printed coded data; generating indicating data using the sensed coded data, said indicating data identifying the document identity and a position of the pen relative to the printed document; sending the indicating to the computer system; and interpreting the indicating data using a stored page description retrievable using said document identity contained in said indicating data.
11. A method for printing and interacting with a document, said method comprising the steps of: receiving, in a computer system, a request for printing said document, said document containing visible information; allocating a document identity to said document; determining coded data for said document, said coded data encoding a plurality of locations on said document and identifying said document identity; sending print data to a printer; printing the document so that the printed document includes said visible information superimposed with said coded data, said visible information and said coded data being printed at the same time by a printer connected to the computer system; interacting with the printed document using an optically imaging pen; imaging at least some of the printed coded data; generating indicating data using the sensed coded data, said indicating data identifying the document identity and a position of the pen relative to the printed document; sending the indicating to the computer system; and interpreting the indicating data using a stored page description retrievable using said document identity contained in said indicating data. 13. The method of claim 11 , wherein the pen comprises a force sensor for sensing when said nib is in contact with said printed document.