David Arnold wrote:

All,

In looking at core-buf.tex to see if I could find anything about subblocks, I came across at line 518:

\def\setblocklevel#1% sign {\global\advance\blocklevel #11 \ifcase\blocklevel\doingblocksfalse\else\doingblockstrue\fi}

Is that 11 correct?

That is not 11, that is #1 followed by 1, and it is called with #1 == + or #1 == -, so the expansion becomes \global\advance\blocklevel + 1 or \global\advance\blocklevel - 1 Cheers, taco