I don't understand you . Let me explain:
I open
https://tiddlywiki.com/. I go to the Contents, Reference, Mechanisms and open the tiddler StateMechanism. I
start reading it. In the middle of the tiddler I can see this line:
history: references the tiddler to be used to store the history stack (see the
NavigationMechanism)
so I try to read this NavigationMechanism tiddler. When I open this link, tiddlywiki says than there is no tiddler called NavigationMechanism.
I am very very sorry. I came from Spain and maybe my english proficiency is not accurate