Imagine that you are working in your computer fully loaded with programs running in the background. Memory is full, CPU usage is high. And now you want to play a game. Lets say a cutting edge game that uses a lot of your computer resources. This software will simply look at your computer's running processes, save them in a list (ignoring the essential windows or system processes), kill (close) all the non-essential process (non-systematic). When you finish your game, click on Return to Normal Mode. and Yups your ex-session is back. So basically this software simply save your session before gaming then load it again in 1 simple click.