[TYPO3] Link "from where we come"?

[Vladimir I. Umnov]

Eplanation of task by example:
-subtree1
--LINK BACK
--page1
--page2
-subtree2
--page1
---page1.1
---page1.2
--page2
---page2.1
---page2.2
---page2.3

I need make a "link back" in subtree1 if we come in subtree1 from 
subtree2, else do not show "link back". And if we moves in subtree1 
after coming from subtree2, link must be persistent.

How can I do that in pure typoscript?