... Oostrum¹¹

A considerable part of this article was written by George Grätzer (University of Manitoba) in Notices Amer. Math. Soc. Thanks, George!

... commands²²

There are similar commands for paragraph and subparagraph but they are seldom used.

... solved³³

This is a simplification of the actual code. Get the real package from the CTAN sites.

...3⁴⁴

The multicol package uses a similar technique.

... preamble⁵⁵

If you have fancyheadings version 1.5 or higher the commands described in this section are already included

... work⁶⁶

It was probably a dumb decision to define the width parameters as lengths. There is no need to and I may change this in a future version of fancyheadings

... trickery⁷⁷

If you have a recent version of the ifthen package the tricks are not necessary. You can then test the \pageref{LastPage} directly.

... situation⁸⁸

After I made this package I discovered a package secret.sty that does a similar thing to mark confidential paragraphs if they cross a page boundary. It does it, however, by changing the output routine.

... work⁹⁹

Actually there is another way but it requires two passes: you can put \label commands before and after the text and compare the \pagerefs.