split – Box two chunks of text side-by side
The widths of the boxes are set by the user.
The operation is reminiscent of the sort of thing the LaTeX package parallel does.
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Maybe you are interested in the following packages as well.
- boxit-ltx: An environment for boxing things
- outerhbox: Collect horizontal material for contributing to a paragraph
- knuth-letter: Knuth's example letter macros
- toc-zar: Plain TeX table of contents macros