Steps forward or backward through a list and outputs the current list item.
The first event to the Go Forward
port outputs the first item in the list. Each subsequent event outputs the next item.
An event to the Go Backward
port goes back to the previous item.
An event to the Go To First
port resets the node, so that the next event to Go Forward
will output the first item.
Keywords: choose, count, element, index, item, member, pick, select