A casino lobby looks like one screen, but separate systems do the work:...

https://web-wiki.win/index.php/What_Is_RNG_Testing_in_Online_Casinos_in_Plain_English%3F

A casino lobby looks like one screen, but separate systems do the work: provider integrations load games, balance records track wagers and wins, and payment status shows whether a deposit is pending or complete. The interface hides those handoffs.