To access your EJB service from PBL you first use standard component Fuego.Ejb.EJBHome to locate the Home interface of your EJB. Using the Home interface, you create a new reference to your Bean.
// Obtain generic reference to an EJB Home object.
// Note: "calculator_ejb" is the name of the External Resource
// defined in your project for "CalculatorHome"
home as Any = EJBHome.locate(configuration : "calculator_ejb")
// Cast
calculatorHome as CalculatorHome = CalculatorHome(home)
// Create reference to EJB object
calculator = create(calculatorHome)
// Use the object
display "5+5="+ makeSum(calculator, arg1 : 5, arg2 : 5)
// dispose the EJB object
calculator.remove();