I have a problem, whit the outstanding explanation of button_state function from the manual:

button_state(PANEL*,var num,var state)
Changes or returns the button state of a panel.

Parameters:
PANEL* Panel pointer.
num The number of the button, starting with 1.
state The new state of a radio or toggle button, ON (1) or OFF (0). -1 leaves the button state unchanged.

from where starts the COUNTING ?

Which button is 1?????
The first declared on the panel ?
Do I need something more to set the state of all the toggle buttons of a panel?