Chapter 16 SSL VPN : Introduction to SSL VPN : Traveling and security : Cache cleaning
  
Cache cleaning
You can enable a cache cleaner to remove any sensitive data that would otherwise remain on the remote computer after the session ends. For example, all cache entries, browser history, cookies, encrypted information related to user authentication, and any temporary data generated during the session are removed from the remote computer. If the client’s browser cannot install and run the cache cleaner, the user is not allowed to access the SSL-VPN portal.
For more information, see “Configuring cache cleaning”.
See Also
SSL VPN modes of operation
Web-only mode
Tunnel mode
Port forwarding mode