Node history list
 
When you open a file, the Goto previous node and Goto next node toolbuttons on the Navigate toolbar are both disabled
 
As soon as you change focus to another node, the Goto previous node toolbutton will become active ,  indicating that you can backtrack.
 
If you backtrack, you will know you have reached the beginning of the history list when the Goto previous node toolbutton is greyed out, while the Goto next node toolbutton is active .  
 
While you are at a node between the beginning and end of the history list, both toolbuttons are active , meaning you can retrace your steps in either direction.

When you have returned to the most recently accessed node, the Goto previous node toolbutton will be active, while the Goto next node toolbutton is greyed out .
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