Define a password to the VNC server to improve security
Currently, the VNC server on Linux clients can be accessed without password, and the VNC server on Windows clients has password sets to "foo". It could be great to define a "real" password to improve security, for example when the helper wants to run the VNC client on his computer instead of the intermediate server.
The easiest solution would be to use the random password that is used for the ssh connection: this should be easy for x11vnc on the Linux clients, but might be harder for UltraVNC on Windows clients. Maybe running the setpasswd.exe could do the trick.