It refers to software which manipulates data and how it functions. So, think in terms of stuff like, rounding significant digits after the decimal point, or doing some math crunching to determine a product value. So I guess it could, in the analysis be either. Typically cmm programs tell the arm to go from point a to b and do some other event, so the linear arm movement is calibrated, but if you had someone writte the least squares circles check or something it might need to be verified.