Click to enlarge, So close. The RS20's control panel is located on the top. In the image on the right, you are viewing the panel from the back of the projector. The three indicator lamps are closest to the front of the projector. They are: Warning, Lamp, and Standby/On.
Further back is the first button, the Power switch. It's the usual press once for on, press twice for off. Next is the Input button, followed by a Hide button to black out the image.
Then comes the four arrow buttons in a diamond shaped arrangement, with a larger Enter button in the center.
Lastly, side by side, are the Menu, and (menu) Back button. Pretty standard stuff. Of course, we all primarily rely on the remote control, and probably only use the control panel during initial setup, if at all.