Steam Link creates an RDP session (I assume their own protocol but for lack of a better term for it) that lets me control my Desktop from my phone.

Once I'm remote on the desktop, I can access my home-lab locally instead of via VPN. Before I moved to Tailscale, my self-hosted Wireguard setup was pretty shaky, and was running on an old Pi that had seen better days.

It's basically just using Steam to jump-box to my LAN, and from there you can do whatever you desktop can do on the LAN. (Steam Link has some oddities around UAC prompts, usually requiring input from the host and refusing from the client.)

You could probably use anything....Parsec, Moonlight, RDP, etc. But Steam is always running on my Desktop, and the phone-app helps a lot. I've used Parsec as well, but sometimes if using a commercial VPN Parsec is unable to connect. Steam tends to still create a session in these scenarios, but YMMV...I'm sure there's some config issues in my setup