A method of enabling user interaction with computer software including, in a computer system transferring print data to a printer, printing a form responsive to the print data by printing information indicative of a text field coincident with coded data indicative of the text field, so that when a sensing device is moved relative to the text field the sensing device can sense the coded data and generate the indicating data indicative of its relative movement, using the indicating data to determine the movement and then perform an action associated with the text field based on the movement. Further in the computer system, the information, an identity indicative of the text field, and a layout defining an arrangement for coded data indicative of the identity and information are determined, and the print data is generated to be indicative of the identity, layout and information.