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
- figplace: Floating figures in Plain TeX
- label-pln: Print address labels in three columns
- twocolumns: Knuth's two-column output macros