an image information display region having a displayed edge; and

a radial pop-up menu located at the edge of the information display region, the radial pop-up menu having a number of menu choices in a semi-circle toward the information display region and opposite of an estimated position of a hand of a user operating a pen, wherein the radial pop-up menu is displayed each time the pen is brought near a designated location along the displayed edge in an orientation based on a radial direction from a point of activating the menu choices and based on a location of the pen relative to the visual plane of the display, wherein a menu choice is activated by a radial stroke from the point of activating the menu choices in a direction toward one menu choice, and wherein a number of menu choices is limited to up to five menu choices based on the estimated position of the hand of the user operating the pen so that the menu choices are not blocked by the hand of the user.