[NTLUG:Discuss] remote control of machine with non-routable IP

[Ralph Green]

Howdy,
  I am thinking about how to remotely control the desktops of Linux
users desktops.  The users will be inexperienced with Linux and I have
almost complete control over what software is installed on their
machines to start them off.  I was originally thinking of running vnc
over ssh where ssh used pre-shared keys and no password connections to
ssh were allowed.  I was going to setup dynamic dns names for each user
that were updated when they connect to the internet.  But, it occurs to
me that some users may not have routable ip addresses.    How would I
reach them?  I'll add that I never want to control their machines
without their approval or secretly.  It will only be to help them with a
problem when they contact me.
 If it affects the suggestions, I might use NoMachine instead of VNC.
After Chris Cox's presentation a while back, I see the performance
benefits.  I just don't have as much experience with it.
Have a good day,
Ralph