<div>If you want to typeset Persian and Arabic, then Yes, you need to explore <a href="http://farsilatex.blogfa.com/cat-4.aspx">http://farsilatex.blogfa.com/cat-4.aspx</a></div>
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<div>(all of the macros are written by Mostafa Vahedi)</div>
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<div>If you want to typeset Persian and Arabic in Plain XeTeX, then explore CTAN at</div>
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<div><a href="http://www.ctan.org/tex-archive/macros/xetex/plain/xpersian/">http://www.ctan.org/tex-archive/macros/xetex/plain/xpersian/</a></div>
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<div>Hope, it helps.<br clear="all"><br></div>