{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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change catcode with tickets (business card print) and tables

Update, much later Don’t do this. Change the font instead. This just causes much trouble in unexpected and hard-to-debug places. See the other answer to the same question for details. changing the ...
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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 ...
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How to allow curly braces in command option

I need to store an URL parameter like &path=weigth:5|color:orange|enc:okydHa}peAXOHi@jANv@A@kJJmFAiDJuAHmDXcBb@cC`@gC^_DV}CJaCF{APaBVkBdAyEf@qC`@{B\aDSwB with later reencoding to utf8 and passing ...