Where is the return value of the recv() method documented?

I'm aware of this from the recv pod:

Returns the address of the sender if SOCKET's protocol supports this; returns an empty string otherwise. If there's an error, returns the undefined value.

But what does it mean by "address"? And which protocals support it; and which not?

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to IO::Socket->recv() method documentation? by BrowserUk

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