Access List Elements
You can access particular list elements using two different notations.
The notation list[index] lets you access elements using a zero-based index number. For example, Data[0] is the first element in the list named Data. Similarly, Data[4] is the fifth element.
Using the notation list#*index* you can access elements using a one-based index number. For example, Data#1 is the first element and Data#5 is the fifth element.
See Work with Lists.