A pen system for recording a track of handwritten information created by a handheld electronic pen. The pen system includes the handheld electronic pen and a second memory unit located in an external data storage device. The electronic pen has an image sensor for optically imaging a position-coding pattern printed on a surface, a processor for recording the handwritten information as digital ink and a first memory unit for storing the digital ink. The first and second memory units are connected in such a way that a transmission of digital ink is caused to occur automatically from the first memory unit to the second memory unit. Receipt of the digital ink by the second memory unit causes the second memory unit to associate the track of handwritten information with a stored description of the surface.