does anybody know how steamos advertises its hostname across your local network? What I mean by this

does anybody know how steamos advertises its hostname across your local network? What I mean by this is I can enable sshd on my deck. I can then change its hostname to anything, in this case 'oleddeck'. Then I can go to my workstation computer and type ssh deck@oleddeck and the hostname gets resolved. If I try with my new bazzite install, the hostname fails to resolve, but I can connect normally with the internal IP. (like ssh deck@192.168.1.20 or whatever). Not any issue I've just been curious how this works.
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