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### 1.6 Unimplemented Features

Unimplemented features include:

- `:ab` and `:una` are not implemented, since `:ab` is considered obsolete, since Emacs has much more powerful facilities for defining 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.