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I have found a service (beamium.com) that does what I wanted but one of the comments suggested screen sharing (at least in Jitsy Meet) doesn't cause that much bandwidth.


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Another to add to your list is Jitsi: https://jitsi.org/. It meets all the requirements you have listed and in addition works on Linux, Android and iOS.


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The easiest way is to trust your students to self assess and include links marked for beginners & for intermediate in the single PFD. Otherwise you can have 3 pdfs one for each level of hints content with the links (or lack of links) in and send them to the appropriate sub-groups of students. One possible location to store such hints, (perfect for ...


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