The TeX extension TeX-XeT (single hyphen: not to be confused with TeX--XeT) produces ‘IVD-DVI’ files which extend DVI files with ‘reflection’ commands for horizontal reversal of text. In general, IVD-DVI files can't be processed by an ordinary DVI processor; ivd2dvi will convert such a file to DVI so that it can be processed by a normal DVI driver.

The author is Larry Denenberg. The package is Copyright © 1988 Larry Denenberg.