MOUSE_SYS_STDBUTTONS
act->button = butmapev[ev->buttons & MOUSE_SYS_STDBUTTONS];
act->button |= (ev->buttons & ~MOUSE_SYS_STDBUTTONS);
act->button = butmapmsc[(~pBuf[0]) & MOUSE_SYS_STDBUTTONS];
act->button = butmapmsc[(~pBuf[0]) & MOUSE_SYS_STDBUTTONS];