An interactive board comprising: an interactive surface; a bezel extending around the edges of the interactive surface; four imaging assemblies, each imaging assembly being positioned adjacent to a different corner of the bezel, wherein said imaging assemblies are oriented so their fields overlap and look across the entire interactive surface; at least one infrared light source, configured to provide IR illumination over the interactive surface during image capture, wherein when the IR illumination impinges on the bezel, the IR illumination is reflected by reflective or retroreflective surfaces of the bezel and returned to the imaging assemblies; at least one user selectable element; and a processing structure (54, 56) in communication with the imaging assemblies and the at least one infrared light source, the processing structure (54, 56) configured to process data received from said imaging assemblies to locate at least one pointer positioned in proximity with said interactive surface and update digital ink according to pointer location; wherein the imaging assemblies are configured to capture a first image frame and a second image frame within an operation cycle, the first image frame is captured with the at least one infrared light source turned on, the second image frame is captured with the at least one infrared light source turned off; wherein the processing structure (54, 56) is further configured to: within the second image frame, when detecting IR illumination provided by the at least one pointer at the pointer location, update the digital ink by generating digital ink corresponding to the pointer location; within the first image frame, when the imaging assemblies detect occlusion of the IR illumination provided by the infrared light source, by an object at an eraser location, update the digital ink by erasing digital ink corresponding to the eraser location, wherein IR illumination provided by the at least one pointer at the pointer location blends with the IR illumination provided by infrared light source so that it remains undetected by the imaging assemblies; and send said digital ink to one or more devices in communication with the interactive board in response to selection of said at least one user selectable element. an interactive surface; a bezel extending around the edges of the interactive surface; four imaging assemblies, each imaging assembly being positioned adjacent to a different corner of the bezel, wherein said imaging assemblies are oriented so their fields overlap and look across the entire interactive surface; at least one infrared light source, configured to provide IR illumination over the interactive surface during image capture, wherein when the IR illumination impinges on the bezel, the IR illumination is reflected by reflective or retroreflective surfaces of the bezel and returned to the imaging assemblies; at least one user selectable element; and a processing structure (54, 56) in communication with the imaging assemblies and the at least one infrared light source, the processing structure (54, 56) configured to process data received from said imaging assemblies to locate at least one pointer positioned in proximity with said interactive surface and update digital ink according to pointer location; wherein the imaging assemblies are configured to capture a first image frame and a second image frame within an operation cycle, the first image frame is captured with the at least one infrared light source turned on, the second image frame is captured with the at least one infrared light source turned off; wherein the processing structure (54, 56) is further configured to: within the second image frame, when detecting IR illumination provided by the at least one pointer at the pointer location, update the digital ink by generating digital ink corresponding to the pointer location; within the first image frame, when the imaging assemblies detect occlusion of the IR illumination provided by the infrared light source, by an object at an eraser location, update the digital ink by erasing digital ink corresponding to the eraser location, wherein IR illumination provided by the at least one pointer at the pointer location blends with the IR illumination provided by infrared light source so that it remains undetected by the imaging assemblies; and send said digital ink to one or more devices in communication with the interactive board in response to selection of said at least one user selectable element. within the second image frame, when detecting IR illumination provided by the at least one pointer at the pointer location, update the digital ink by generating digital ink corresponding to the pointer location; within the first image frame, when the imaging assemblies detect occlusion of the IR illumination provided by the infrared light source, by an object at an eraser location, update the digital ink by erasing digital ink corresponding to the eraser location, wherein IR illumination provided by the at least one pointer at the pointer location blends with the IR illumination provided by infrared light source so that it remains undetected by the imaging assemblies; and send said digital ink to one or more devices in communication with the interactive board in response to selection of said at least one user selectable element.