{catcodes} is about "category codes" — an integer number from 0–15 associated to each of the 256 character codes. The category codes indicate the role of a character.

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\title after \begin{document}: When to do it?

My answer to Problem using \alert{} in Beamer title with metropolis theme solves an incompatibility problem between TiKZ and \title with \protect-ed contents in beamer documents. Following code ...
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\makeatletter within a beamer frame: how?

Within a beamer frame (not outside) makeatletter (or \catcode\@=11`) does not work. \documentclass{beamer} \makeatletter \def\my@command{My at command} \def\myatcommand{\my@command} \makeatother ...
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Environment where everything is escaped automatically

I wan't to use latex to allow users to generate PDF-Reports on the fly. The problem is that a part of the document gets filled with information from the user-side. What I'm looking for is an ...