How to use "operating" in a sentence

Even these days, when most machines could be played with electronically validated value cards, the nickel duchesses wore black gloves to keep their hands from becoming filthy after hours of handling coins and pulling levers; they always sat on stools while they played, and they remembered to alternate hands when operating the machines in order not to strain the muscles of one arm, and they carried bottles of liniment just in case.

"And you know what it reminds me of? It's the same damn feeling I had in Angela's office when that computer terminal started operating on its own

In the car again, with the doors locked and the engine running and the heater operating full-blast, they sat in stunned silence, basking in the warm air, but shivering nonetheless.

We're both wiped out, operating on sheer desperation