A system for enabling user interaction with computer software which includes a computer system which transfers print data to a printer. The printer is responsive to the print data to print a form 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 movement relative to the text field. The computer system uses the indicating data to determine the movement and then perform an action associated with the text field based on the movement. The coded data is indicative of an identity and the computer system determines the identity using the indicating data and a page description using the identity, and identifies the text field using the page description.