But, a button is a spot you touch to get a specific reaction from your horse. For example, on the ground we're working on a front button on each side of Joshua. You push on him in the front (by his shoulder but at the top of the leg) until he moves his front leg away from you. You the same thing for a button in the back. It's also good to install a back button on the chest. (Unfortunately it doesn't make the truck beeping noise.)
Buttons are handy. If you have a button on the ground you have a button in the saddle. If you touch a horse on the button in the saddle he'll move for you without reins.
We also teach the horse to turn when we walk around to their back sides. I don't ever want to see horse butt since showing your bottom is a sign of disrespect. When we're grooming or doing hooves I always touch Joshua so he knows I'm there and doesn't turn to face me. He's a very young boy but I don't have to tie him to groom him. My daughter just loves to walk around the arena with him because he'll follow her around like a puppy dog without a lead.