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
- eqnnumwarn: modifies the amsmath equation environments to warn for a displaced equation number
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- plcalendar: Plain macros for making nice calendars