!!IN - In (List) 

The In (IN) operator checks to see if Operand 1 is contained in the list found in Operand 2. 

See [$L|$L_VARIABLE]

;Statement:If an employee is non-union, charge $5.00 for coffee service (into PC 1015)

||Line||CMD||OT||Operand 1||OPER||OT||Operand2||OT||Operand3||If Goto||	Else GoTo
|00010|	IF|	DB|	DUN.UNITE_CODE|	IN|	$L|	UC-NON UNION UNITS|  |  |00100|	99999
|00100|	LET|	PC|	1015|	EQ|	N|	5|  |  |99999|	
|99999|	EXIT|  |  |  |  |  |  |  |  99999|	

Here the UserCalc checks to see if the employee’s unit (Operand 1) is included in the list of non-union units (Operand 2). If yes, the UserCalc goes to line 00100 to charge $5.