An item-ID is a unique identifier by which an item can be retrieved from a file. An item-ID may be any length up to 100 characters. It can be made up of any characters except the system delimiters; sm, am, vm, svm, or sb, and any character with an ASCII value 247 or greater. If any of these reserved values are used in an item-ID, the item-ID will be truncated at the first use of such a character. It is recommended that characters with ASCII values greater than 127 not be used since they may not display or show as different symbols on different display or printing devices.