HelenOS sources

DM_SYSTEM         313 uspace/app/trace/ipcp.c 		if ((display_mask & DM_SYSTEM) != 0) {
DM_SYSTEM         352 uspace/app/trace/ipcp.c 	if ((display_mask & DM_SYSTEM) != 0) {
DM_SYSTEM         711 uspace/app/trace/trace.c 			dm = dm | DM_SYSTEM | DM_USER;
DM_SYSTEM         799 uspace/app/trace/trace.c 	display_mask = DM_THREAD | DM_SYSTEM | DM_USER;