FUNC DFS_TRACE_HIGH{LEVEL=1}(FLAGS ,MSG,...);
FUNC DFS_TRACE_NORM{LEVEL=2}(FLAGS ,MSG,...);
FUNC DFS_TRACE_LOW{LEVEL=3}(FLAGS ,MSG,...);
FUNC DFS_TRACE_ERROR_HIGH{LEVEL=1}(ERROR,FLAGS,MSG,...);
FUNC DFS_TRACE_ERROR_NORM{LEVEL=2}(ERROR,FLAGS,MSG,...);
FUNC DFS_TRACE_ERROR_LOW{LEVEL=3}(ERROR,FLAGS,MSG,...);