[OS X TeX] Synchronization

[Douglas McKenna]

Herb Schultz wrote -

> I would expect it all to
> work fine after one typeset since (xe/pdf)latexmk will rerun (xe/pdf)latex the
> necessary number of times to resolve the cross-references in one typeset run.

What is the condition after a TeX/LaTeX run that informs the world that
a typeset run needs to occur a subsequent time to resolve cross-refs?

Doug McKenna