Params list is a binary value containing an Apple event descriptor list.
Action Determines the number of items in the list.
A number indicating the number of items in the list. If list is not a binary value containing a valid descriptor list, 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. The sizeOf verb can be used to determine the number of list items.