@kelfka Hi, I haven't tried it myself yet, but maybe you could try opposite approach. Demostration mode should let you stream the screen from one PC (smart board) to other clients (kids)... You start the action from Master PC... kids do not have to do anything...
Manual:
You can use the demonstration mode (demo mode) to start a presentation. In this mode, the content of your or a student’s screen is broadcasted to all computers and displayed in real time. You can choose between a full screen and a window demo.