VNC stands for Virtual Network Computing and refers to a family of software which allows us to connect to a remote computer’s screen, keyboard, and mouse, via the network and use the computer as if we were actually sitting in front of it. We also tend to use it as a verb; for example:
“I’ll just VNC into the computer…”
…means that I am going to connect to the computer using VNC in order to operate it remotely.
This is extremely useful not only for carrying out maintenance, but also in view-only mode, since it allows us to watch what the user is doing wrong without having to walk halfway across the school, so we can tell them over the phone what an idiot they are instead of having to do it to their face.