Ok, this may not be important for a classroom teacher, as it would be more geared to a technology staff member, although you may want it at home. I usually refrain from paid apps, but trying many free, I just did not find one as good as VNC.
So VNC is Virtual Network Computing. In other words, you can ‘remote’ to another computer from within your network (i.e. in the same building) or across networks (i.e. your parents in Pennsylvania). Many vendors produce apps, both paid, and free. Before tablets, and still, we use VNC on the desktop within our district to remote to a users computer and hopefully fix their technical problem, without the need to drive to their school. Saves lots of time. We use RealVNC, a pretty good product for quick connections.
With that in itself, it is worth the money. I can visit a school, face a challenging tech issue, and remotely connect to my desktop. Or if I am out and about, and there is another quick problem, I can take care of it. For those not in a tech department–maybe you have a home media server like I do. I keep it ‘headless’–running, but with no keyboard, mouse, monitor. If I want to access files, I need to use the VNC. Or if you are downstairs and want a file off an upstairs computer.
So definitely the application presents itself. I just struggled with slowness on the free apps. Android/Google is currently working on one, Android VNC, and you can find many more, but nothing worked in my case like RealVNC. But try the others, see if they work better for you.
VNC for Android $9.99