The Secure Shadowing function is only relevant to clients which meet the requirements for secure shadowing and have enabled the corresponding option. Secure shadowing improves security when remote maintaining a client via VNC at a number of locations:
This is independent of the VNC viewer used.
Direct shadowing without logging on to the UMS is not possible.
Direct shadowing of a client by another computer is likewise not permitted.
In addition to the connection data, the associated user data (shadowing UMS administrator, optional) can be recorded in the log too.
Further information regarding secure shadowing can be found in the How-To document Secure Shadowing.