As I work with schoolkids, I've found the best way is to direct with long thin stick like a baton. You can keep your hand well out of their vision and indicate

As I work with schoolkids, I've found the best way is to direct with long thin stick like a baton. You can keep your hand well out of their vision and indicate where you want the mouse to go. If you drive for them, they will not know what you did. (to be fair, when I point and tell, they don't always know what they did either)