Symbol: MOUSE_4DPLUS_BUTTON4DOWN
sys/dev/atkbdc/psm.c
5105
if (pb->ipacket[2] & MOUSE_4DPLUS_BUTTON4DOWN)
usr.sbin/moused/msconvd/msconvd.c
1784
if (pBuf[2] & MOUSE_4DPLUS_BUTTON4DOWN)