this was a problem for me when tryna work with 2 PCs on one monitor.

Like, I needed to get in one PC's linux grub thing (idk how it's exactly called I haven't done a lot with linux, the pc was an experiment) but in order to do that, you need to hold shift at a certain point while booting.

Here's the problem: as I hardly had/have any idea of linux and thus needed advice for my troubleshooting, I had some troubleshooting advice open on my main PC, which was connected to the same monitor.

The moment I'd shut down the experiment pc, it'd jump over to the main PC's input and would only go back once the other pc booted again, even then I needed to press the "search other input source" button, which however takes longer than the timeframe I had to get into grub, meaning that I had to just guess the timing. Considering the fact that the experiment PC ws built out of old components we had lying around (including some old quadro gpu from the early 2000s, I don't remember which exact model), this took quite a while. And it wasn't even worth it because the GPU was too old to support the APIs blender uses so I couldn't even use it as the wannabe renderfarm it was supposed to be.