This function displays the function key labels for the given window at the bottom of the display.
UINT ShiftState: Refers to the "shift" (<Ctrl>, <Alt>, <Shift>) key state to display the defined function keys for. ShiftState uses the same values as those previously defined for the KeyNum field the LHFKEY structure and are:
FKEY_ALONE.
FKEY_CTRL.
FKEY_ALT.
FKEY_SHIFT.