clientserver with sockets?

I read here that you can use a socket do clientserver functionality but I
can't figure out where the socket is;

Is it a file socket in the file system like mysql used to use?

Is it a tcp socket?

I don't see it mentioned anywhere in the remote.txt help file.

The reason I ask is that I'm using WSL2 and I can't seem to get a list of
servers with `vim --serverlist` even though I have a vim server running.

Thank you,
   helpdeskaleer

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