Remote assistance for X

[Warren Block]

A remote computer used by relatives is running FreeBSD and X.  I'd like 
to find a method to work with the remote desktop to help them solve 
problems and maintain the system.

The remote user's existing desktop should be shared, rather than 
creating a new session.

Traffic and passwords should be encrypted.

The remote system could be on dialup, so faster is better.

The remote system should initiate the connection so there's no need for 
the remote users to change firewall settings.  Also no security concern 
when the software isn't being used.

So far, ssvnc and x11vnc look to be the only combination that meets the 
requirements.  Are there others?

-Warren Block * Rapid City, South Dakota USA