don't understand Tlink

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Could someone could explain with an example what Tlink is and what used for ?

Mylist:TList=createlist()
listaddlast Mylist,"one"
listaddlast Mylist,"two"
listaddlast Mylist,"three"
for a$=eachin Mylist
	print a$
next


perhaps a method to navigate into this list. So you can automaticaly store an index and obtain the next item ? for example :

next item into MyList is "two" ? next will be "three" !