The package provides the Arabic and Farsi script support for TeX without the need of any external pre-processor, and in a way that is compatible with babel. The bi-directional capability supposes that the user has a TeX engine that knows the four primitives \beginR, \endR, \beginL and \endL. That is the case in both the TeX--XeT and e-TeX engines. Arabi will accept input in several 8-bit encodings, including UTF-8. Arabi can make use of a wide variety of Arabic and Farsi fonts; PDF files generated using Arabi may be searched, and text may be copied from them and pasted elsewhere.