@inforef@inforef is used for cross references to Info files for which
there are no printed manuals.  Even in a printed manual,
@inforef generates a reference directing the user to look in
an Info file.
  
The command takes either two or three arguments, in the following order:
Separate the arguments with commas, as with @xref.  Also, you
must terminate the reference with a comma or period after the
}, as you do with @xref.
The template is:
     @inforef{node-name, cross-reference-name, info-file-name},
     
Thus,
     @inforef{Expert, Advanced Info commands, info},
     for more information.
     
produces
     *Note Advanced Info commands: (info)Expert,
     for more information.
     
and
See Info fileinfo, nodeExpert, for more information.
Similarly,
     @inforef{Expert, , info}, for more information.
     
produces
     *Note (info)Expert::, for more information.
     
and
See Info fileinfo, nodeExpert, for more information.
The converse of @inforef is @cite, which is used to
refer to printed works for which no Info form exists.  See @cite.