The calibration process simply lets the system know exactly where the pen is in relation to the image. The SmoothBoard software has four calibration points. The first one appears in the top left corner of the image. When it is selected, another appears at the top right, then bottom right and finally bottom left. 
It is very important that the user clicks accurately in the exact middle of the crosses. If this is done without care, the pen tip and cursor will be in different places - very frustrating!
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