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.
- ovalfbox: Boxes with frames whose corners are rounded
- automagic: Automagic numbering in Plain TeX
- plain-cm: Variable sized fonts in Plain TeX
- twocolumns: Knuth's two-column output macros