`varioref': Variable Page References
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   `varioref' is a frequently used LaTeX package to create
cross-references with page information.  When you want to make a
reference with the `\vref' macro, just press the `v' key in the
selection buffer to toggle between the `\ref' and `\vref' (*note
Referencing Labels::.).  The mode line of the selection buffer shows
the current status of this switch.  If you find that you almost always
use `\vref', you may want to make it the default by customizing the
variable `reftex-vref-is-default'.