How do I share what is happening in my HTC VIVE Focus Vision with others?

The Focus Vision supports screen casting functionality via an external display or through a web browser.

For casting to an external monitor, instructions are available on this page: 
https://www.vive.com/us/support/focusvision/category_howto/casting-headset-to-external-display.html

For casting to a web browser on a computer or mobile device, instructions can be found here:
https://www.vive.com/us/support/focusvision/category_howto/casting-headset-to-browser.html

To view what someone is seeing while using the HTC VIVE Focus Vision in PC VR mode, use the screen mirroring function found in VIVE Hub:
https://www.vive.com/us/support/vs/category_howto/see-whats-happening-on-the-device.html