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(viper)Unimplemented Features

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Unimplemented Features
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   Unimplemented features include:

   * `:ab' and `:una' are not implemented.  Both `:map' and `:ab' are
     considered obsolete, since Emacs has much more powerful facilities
     for defining keyboard macros and abbreviations.

   * `:set option?' is not implemented.  The current `:set' can also be
     used to set Emacs variables.

   * `:se list' requires modification of the display code for Emacs, so
     it is not implemented.  A useful alternative is `cat -t -e file'.
     Unfortunately, it cannot be used directly inside Emacs, since
     Emacs will obdurately change `^I' back to normal tabs.