Use the NEXT method
iteratively to traverse the hash object and return the data items
in key order.
The FIRST method returns
the first data item in the hash object.
You can use the PREV
method to return the previous data item in the hash object.
Note: The NEXT method sets the
data variable to the value of the data item so that it is available
for use after the method call.
Note: If you call the NEXT method
without calling the FIRST method, then the NEXT method will still
start at the first item in the hash object.