maybeload – Prevent reloading of files
Defines a command \thisfileis, which will become \endinput if it's called for a second or subsequent time with a particular file name.
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Maybe you are interested in the following packages as well.
- comment-pln: Comment macros for use in Plain TeX
- perfectcut: Nested delimiters that consistently grow regardless of the contents
- letter-plain: Letter macros for Plain TeX
- lettermac: Simple macros for writing letters (Plain TeX)