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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control TeX’s behaviour during compilation
Maybe you are interested in the following packages as well.
- comment-pln: Comment macros for use in Plain TeX
- texfot: Filter clutter from the output of a TeX run
- figplace: Floating figures in Plain TeX
- label-pln: Print address labels in three columns