Yep, I knew I would lost someone with the X approach.

So the solution I was asking was to mirror the PC display to a headset, more precisely here, I would like to mirror the tablet display on the AR headset. Why ? Because originally, the solution that I found to annotate dynamically, was for my friend to share his screen with me so I could see what he sees on his desktop (I know, it's so stupid to do it that way, but I couldn't find a solution that would do it simply). As I'm streaming what I see live, he would see what I see and he could annotate on his desktop PC for instance. And as he is sharing his screen with me, I would see his desktop monitor with annotations on my tablet, at this point I need the mirror tablet to AR.

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You basically just want to live stream video from your HMD over the internet, and then send back hand-drawn annotations.

And yes that is the big big picture. Additionnal context would be Windows OS as I'll use a surface tablet for raw power.

Thank you for the link, I read the description and I'm having issues picturing what it does exactly, do you know if there is a demonstration video somewhere ? Don't get me wrong, the description seems to do exactly what I need (well almost, I'll do the rest of course), but there is a huge difference between what I understood of the project and what it does exactly.

Thank you very much for your help,
Best regards,
Joseph

Sorry I didn't see the article. Thank you very much, I'll dig deep in the solution before asking further questions.