Users create this software themselves and often overlook how important it is. In some types of embedded systems, the application software and the operating system software may be indistinguishable to the user, as in the case of software used to control a VCR, DVD player or Microwave Oven.
You can jam milk through pretty small holes with force like that. Before homogenization, fat globules range in size from 1-10 microns (a micron = ~0.00004 inch). After, the size range is reduced to 0.2-2 microns.
On a health note, I strongly believe that cultured (hence unpasteurized) dairy products encourage good intestinal flora and are healthier then pasteurized products and homogenized/pasteurized milk. That is why I make cultured dairy products at home. (as a foot note: Milk for cheese making is pasteurized differently (low temp, long time) then other liquid milk (high temp short time) and never homogenized. It is difficult (not impossible) to make cheese with homogenized/pasteurized supermarket milk.