With lots of shows featuring many Internet fed video contributions. Anything special being done for this? Or just racks of PCs being plugged HDMI into the desk (with maybe cropping to hide controls etc) running zoom, teams, skype etc? Or any special broadcaster software or devices being deployed? I.e do they give people special software before their appearances?
For single contributions it is as you say just PCs running TV the software, either one with an SDI output or one with a convertor that makes it SDI* You can't really go about sending special software to contributors, you just use what they have, whether that's Skype or Facetime or WhatsApp. Reporters will have special software like Luci Live
I'm pretty sure that in a lot of cases where there's real time interaction, for example Have I Got News For You the recording is taking place via a Zoom chat or similar, but what you're seeing is recorded locally. The quality isn't studio quality but it's much better than streaming Internet quality.
*TV companies never use HDMI except for either feeding a domestic monitor or where they are using a domestic device like a STB or DVD, they are converted to SDI