It is possible that the question is quite easy and noob, but still. I just wondered out of curiosity. My laptop and the built-in antalovsky, and a discrete NVIDIA graphics card. Fumbled with the settings, I found it in any application which video card to use. And which graphics card by default. And how to determine which of them is used in a given time? And depending on what they switch? (It seems to be not just stupid "list of apps", but also depending on load).