{grouping} is about the grouping mechanism in TeX, and about local and global assignments.

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How to display some text based on a condition inside a tabular environment?

I defined a variable \@afwezig that holds people that were not present at a certain meeting. \long\def\@afwezig{} \def\afwezig#1{\def\@afwezig{#1}} Now I want to make the header of the meeting ...
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Why are box dimension assignments both local and global?

Consider the following code. \setbox0 \hbox{XXX} \fbox{\copy0} { \setbox0\hbox{ZZZ} {\wd0 0pt} \fbox{\copy0} } \fbox{\box0} This produces three ruled boxes. The two XXXs ...
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When should one use \begingroup instead of \bgroup?

Is there ever a case when the use of \begingroup is preferred to \bgroup? Obviously, \bgroup is necessary in cases where you need to have balanced braces and thus cannot use {, but when is it ...