The present invention provides a method for enabling instruction of a computer to perform tasks, the method including the steps of: providing a user with at least one form printable on a surface to provide one or more first viewable information zones relating to one or more available commands and one or more second viewable information zones relating to one or more objects; receiving, in a computer system, indicating data from a sensing device operated by the user regarding movement of the sensing device relative to the surface, said movement including a stroke of part of the sensing device on or relative to said surface; determining, in the computer system and from the indicating data, if the stroke substantially links one or more of said first viewable information zones with one or more of said second viewable information zones, and thereby interpreting the stroke as designating (i) a respective one or more of said available commands and (ii) a respective one or more of said objects; and applying in the computer system the designated one or more of said available commands to the designated one or more of said objects.