[sabhiram]

What does it mean for a child to understand? For a baby? A dog? A command line application?

Understanding implies comprehension of some input, to influence a future state. Surely my stateful database understands requests that come to it. It, however will never surprise me with behavior that I would (should) not expect. I suppose if you "understood" the human machine and mind well enough, it would be possible to predict the actions it will carry out.