Action Adds item to the descriptor list at itemAddr with the index or key indicated by position.
If there is an object at listAddr that is not a binary value containing a valid descriptor list, an error occurs. If position is a string4 keyword, and the list is not a keyed list, or if an index is provided that is out of range, an error occurs. This verb is only implemented in the Mac OS version of Frontier. Notes Frontier 3.0 and above supports direct list and record manipulation using square bracket syntax and addition. Passing a zero index in position indicates that the item is to be added at the end of the list.