(texinfo) anchor

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 `@anchor': Defining Arbitrary Cross-reference Targets
 =====================================================
 
   An "anchor" is a position in your document, labeled so that
 cross-references can refer to it, just as they can to nodes.  You create
 an anchor with the `@anchor' command, and give the label as a normal
 brace-delimited argument.  For example:
 
      This marks the @anchor{x-spot}spot.
      ...
      @xref{x-spot,,the spot}.
 
 produces:
 
      This marks the spot.
      ...
      See [the spot], page 1.
 
   As you can see, the `@anchor' command itself produces no output.
 This example defines an anchor `x-spot' just before the word `spot'.
 You can refer to it later with an `@xref' or other cross-reference
 command, as shown.   Cross References, for details on the
 cross-reference commands.
 
   It is best to put `@anchor' commands just before the position you
 wish to refer to; that way, the reader's eye is led on to the correct
 text when they jump to the anchor.  You can put the `@anchor' command
 on a line by itself if that helps readability of the source.  Spaces
 are always ignored after `@anchor'.
 
   Anchor names and node names may not conflict.  Anchors and nodes are
 given similar treatment in some ways; for example, the `goto-node'
 command in standalone Info takes either an anchor name or a node name as
 an argument.  ( goto-node (info-stnd)goto-node.)
 

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