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ChalkBox is an annotation program for Habilience Optical Touchscreen users. Anyway, it works with almost any Windows PC. It's a simple application to write, draw, erase and save for future use. There are three means of writing i.e. the pen, the marker, or the oriental brush. One can also change the color and the thickness of each pen, marker, or brush. You can also draw circles, rectangles, and triangles.