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2

Originally I thought this might be resolved by using the supported LaTeX syntax of \makebox[0pt][l]{<content>} rather than the plain-TeX \llap, but the behavior is the same. The \Xlap commands cause issues in certain places because they are \hboxes (TeX primitives, not \mboxes (LaTeX macros). See further details here. Might be worth noting in any case. ...

36

TeX, as designed by Knuth, has various registers addressable with an eight bit number (that is, from 0 to 255). Registers are of type \count \dimen \skip \muskip \toks \insert \box Let's consider the \dimen registers, for the others the allocation mechanism is similar. Each register is addressable by its number, for instance \dimen34=42pt \kern\dimen34 ...

16

classic TeX has 256 registers (eg count and dimen registers as allocated by \newcounter and \newlength in LaTeX. For some years LaTeX formats have used the extended etex (or pdf(e)tex engines rather than classic TeX, so actually there are 32768 registers available. However for compatibility reasons (or stubbornness, or apathy, depending on your point of ...

9

Run texdoc etex and you'll get the documentation of eTeX. Two of the nice new features are \dimexpr and \numexpr. Instead of 256 available counters, dimensions, etc. there are now 2^{15}. ε-TEX increases the number of TEX’s count, dimen, skip, muskip, box, and token registers from 256 to 32768. eTeX is the default engine for all programs except of ...

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