The current version of
<a href="http://www.vim.org/"> VIM (vi improved)</a>
does not handle bidirectionality correctly, as does vi.iv.
It is therefore necessary to transfer the bi-directional behavior of vi.iv
to VIM. This will allow VIM to be used for editing Arabic, Hebrew, Persian,
and Urdu.
<br>
Habusha, U. and Berry, D.M. ``<tt>vi.iv</tt>, a Bi-Directional Version of
the <tt>vi</tt> Full-Screen Editor,''
<cite>Electronic Publishing, Origination, Dissemination, and Design</cite>,
3:2, pp. 65--91, 1990
<a href="FTP_SITE/reprints.journals.conferences/vi.iv.journal.paper.pdf">
PDF preprint</a>