But I'm thinking that most networks have something like VNC installed for Tech support like we do. If you support multiple sites, it's an obvious choice. Plus VNC vs RDP, VNC is slower but RDP locks the PC and the user can't see what is going on which is 99% of the time bad. VNC is good to sow people things and to leave a very small footprint. But it can be left wide open.
PS. I'd be a little put off if a 16 year old was on my network doing anything.