What is "primary domain" in a local network without Active Directory?

Giganews Newsgroups
Subject: What is "primary domain" in a local network without Active Directory?
Posted by:  JJ (jj4publ…@vfemail.net)
Date: Sat, 5 Oct 2019

When reading the remarks of the `CreateMailSlot()` function description, I
was curious about the use of a "*" wildcard in the server name part of the
path. i.e.:

[Format]
\*\mailslot
ame

[Usage]
Retrieves a client handle to all mailslots with the specified name in the
system's primary domain.

But I'm confused about that "primary domain" term. I know it's related to
Active Directory, but I don't have any Windows Server system in my local
network, so AFAIK, there's no Active Directory. Thus, what does "primary
domain" refers to, in a local network without Active directory? Does it mean
all computers in the same workgroup as the application which uses that path?
Or is it all computers in the local network including those which are in
different workgroups?

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