Showing from one machine on another.
We have a visually impared student arriving next term.
They apparently won't be able to see the board easily.
Whilst they have been supplied with a laptop we need a method of sending whatever is on the teacher's machine to their laptop.
This needs to be under the control of the teacher.
Typically software either works the wrong way around, needing a connection to be initiated from the viewing end. or comes with complex/expensive licencing structures more designed for one "teacher" to take control of several student machines.
What's needed for this situation is for an arbitrary number of machines to be able to send to one machine. If several try to send in turn the student's machine should display the most recent sender.