Patent ID: 7464880

Claim:
A method of enabling online purchasing via a printed form, said method comprising the steps of: providing the printed form containing information relating to a purchasing transaction and coded data printed as a collection of tags, each tag identifying an identity of the form and the position of the tag on the form form, the coded data comprising a plurality of undifferentiated marks positioned relative to a set of predetermined nominal mark positions, operatively positioning an optically imaging pen relative to the form, said pen having a nib; sensing a tag on the form; computing the position of the nib from an observed perspective distortion on the sensed tag and a known spatial relationship between the pen's physical axis and the pen's optical axis, said axes being different from each other; transmitting, to a computer system, indicating data from the pen, said indicating data being indicative of the identity of the form and a position of the nib relative to the form; thereby enabling the computer system to: identify at least one parameter relating to the purchasing transaction using the indicating data; and initiate the online purchasing using the at least one parameter identified.