man man indicate that the
-m switch or its counterpart the
--systems long switch may be used to specify a remote host to get man pages from.
The page also mentions the
SYSTEM environment variable to be used for the same purpose.
Apparently simply specifying a remote IP address as an argument to the switch isn't enough to achieve such a convenience.
I'd like to have more elaboration and real examples that would make one to read FreeBSD man pages on Linux for instance.