Vedis Built-in Commands - Set/Lists
the element at index index in the list stored at key. The index is
zero-based, so 0 means the first element, 1 the second element and so
on. Negative indices can be used to designate elements starting at the
tail of the list. Here, -1 means the last element, -2 means the
penultimate and so forth.
When the value at key is not a list, an error is returned.
Refer to the download page for some C/C++ samples on how to invoke this command from your host application.