Product documentation is available on the Ivanti documentation website. You can directly access Tunnel documentation at this link.
To use the documentation:
Navigate to the Ivanti documentation website, for example:
Optionally, select a product category and language.
Enter a search term.
Select a product from the results.
Click the associated documentation links.
If you have a Cloud deployment, the Ivanti Neurons for MDM Administrator Guide is also available from your instance of Cloud through the Help link in the user interface.