@Hanzo: Thanks that's very helpful. If i understand your explanation to "Fourth" correctly, then C and D are executed IF B. So i deduce the following are synonymic. IF A THEN B:C IF A THEN B C ENDIF Are the following possible? 1) IF A AND B THEN C 2) IF A OR B THEN C 3) IF A AND (B OR C) THEN D 4) IF (A AND B) OR C THEN D