Patent ID: 7791598

Claim:
A device comprising: a digital pen, comprising an electromagnetic signal receptor; a cradle, enabled to be moved across a tracking surface on which it is disposed; an electromagnetic signal emitter, comprised in either the digital pen or the cradle, and configured such that the electromagnetic signal receptor is enabled to receive tracking signals reflected off the tracking surface from the electromagnetic signal emitter; and a communication component, comprised in the digital pen, and enabled to communicate information from the electromagnetic signal receptor to a computing device; wherein the cradle includes a docking bay in which the digital pen is enabled to be receivingly docked such that the digital pen is oriented toward the tracking surface and has an unobstructed path between the electromagnetic tracking signal receptor and an intended position of the tracking surface: and wherein the digital pen becomes communicatively connected with the cradle when it is docked in the cradle such that the cradle is configured to communicate one or more signals to the digital pen.