Symbol: MS_HW_BUT3
usr/src/uts/sun/io/ms.c
1111
mi->mi_buttons = c & (MS_HW_BUT1 | MS_HW_BUT2 | MS_HW_BUT3);
usr/src/uts/sun/io/ms.c
873
ms->ms_prevbuttons = MS_HW_BUT1 | MS_HW_BUT2 | MS_HW_BUT3;