From left to right, top to bottom:
The first button is the Instrument Guide Lights On/Off toggle.
The second lets you view your connected instrument info.
The third is Automatic Target Recognition. When depressed, ATR is active.
The fourth button provides easy selection of EDM measuring modes.
The fifth toggles automatic centering of the map view.
The sixth allows you to adjust your instrument tolerances.
The seventh button is for activation and de-activation of the leveling laser.
The eighth allows you to adjust your search settings.
The ninth is used when rotating your total station.
The tenth button allows you to change to a different instrument.
The last button is move-by-keys toggle.
When this button is active,
you can rotate the instrument about its axes by using
the up/down/left/right cursor keys (or joystick control)
on your handheld device.