Symbol: MOUSE_PS2VERSA_TAP
sys/dev/atkbdc/psm.c
4877
ms->button |= (c & MOUSE_PS2VERSA_TAP) ? MOUSE_BUTTON4DOWN : 0;
usr.sbin/moused/msconvd/msconvd.c
1742
(pBuf[0] & MOUSE_PS2VERSA_TAP) ? MOUSE_BUTTON4DOWN : 0;