 Procedure names used in the package also are local, but can be made external by means of the codice_96 option of the codice_97.The codice_98 executed in an ON-unit terminates execution of the ON-unit, and raises the condition again in the procedure that called the current one (thus passing control to the corresponding ON-unit for that procedure).The codice_99 condition handles invalid operation codes detected by the PC processor, as well as illegal arithmetic operations such as subtraction of two infinite values.