IB - Is Between
The Is Between (IB) operator checks to see if Operand 1 can be found between the values of Operand 2 and Operand 3. 
Statement:			If the employee has worked for the company for between 5 and 10 years, give a bonus of $100.00 in the last pay of the year (stored in PC 5000).
Line	CMD	OT	Operand 1	OPER	OT	Operand2	OT	Operand3	If Goto	Else GoTo
00010	LET	V	YEARS SERVICE	YBT	DB	EEM.HIRE_DATE	$S	PERIOD-END-DATE	00020	
00020	PPE			EY	$S	PERIOD-END-DATE			00100	99999
00100	IF	V	YEARS SERVICE	IB	N	5	N	10	00200	99999
00200	LET	PC	5000	EQ	N	100			99999	
99999	EXIT								99999	

Line 00100 instructs the UserCalc to check if the years of service (Operand 1) are between 5 (Operand 2) and 10 (Operand 3) years.