One of my volunteer activities is to help newbies and others navigate our organization's web interface, which is complex. I have finally realized that to be more effective, I need to watch their screen (with their permission) and help them find the next steps to take, which are frequently not that obvious.
It would be like using the typical support technician's software that he uses to take over your computer, except that I expect to mostly observe and advise. (I don't intend to do their job for them!)
I use a PC but I think it should work with remote Apple machines, if possible.
There several applications out there that provide this capability. Can someone give some reasons to choose one over the other? Cost is a factor, but is not overriding.