Can I watch what is playing on OSMC over my LAN?

…and my devices don’t have ethernet.

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Or something like What Is Wireless HDMI and Should You Use It? (howtogeek.com)

Thanks. I did read that one before posting. With only the one HDMI device (the main TV) it doesn’t solve the problem, unfortunately. Hence the wanting to watch over the LAN, rather than transmission and receiving, but hey, ho. Maybe in the next 20 years…!

This worked when I tried it a couple of years ago. It was a little out of sync though.

That looks like the technique I mentioned above. May not work on live streaming content and it’s 5 years old, now.