Symbol: MOUSE_EXPLORER_BUTTON5DOWN
sys/dev/atkbdc/psm.c
5005
(pb->ipacket[3] & MOUSE_EXPLORER_BUTTON5DOWN) ?
usr.sbin/moused/msconvd/msconvd.c
1648
act->button |= (pBuf[3] & MOUSE_EXPLORER_BUTTON5DOWN)