Guide to LaTeX (4th Edition) (Tools and Techniques

336 Chapter 15. Presentation Material
Font commands can be included in the new definitions, but one should
be aware that the commands \slideheadfont and \slidefootfont are
always inserted into the head and footlines. These are defined to be
\scriptsize, but may be redefined by the user.
It is possible to select different page styles for the slides and notes.
The \pagestyle command sets the style for both (as well as for the
article output) while \slidepagestyle applies only to slides.
Page breaking
Unlike SLIT E X where each slide environment generates a single slide (and
warnings if it is too big), the seminar package allows the text to break
naturally into multiple slides just as normal text does into pages. A new
slide may be forced with \newslide.
You can add some extra tolerance for the page breaking by specifying
\extraslideheight{len}
where len is the additional height allowed before a break in automatically
inserted. By setting this to be large, automatic page breaks never occur,
and the user has full control, either with \newslide or by ending the
environment. Setting it to 0 pt causes pages to be broken as for regular
text. The default is 10 pt.
15.2.5 Selective output
One can select to output just the slides, or just the notes, or both, by
adding one of the options slidesonly, notesonly, or notes to the
\documentclass command. There is also a notesonly* option to print
the notes alone in article output but with indicators for the slides.
A problem arises if slidesonly has been selected. Any global specifications
issued after \begin{document} and outside of a slide environment
will be ignored. One might want to redefine parameters in this way;
including them inside the slide environment makes the changes local to
that one environment. To avoid this, such global commands should be
placed inside a allversions* environment. (If you actually want to include
text and not just non-printing specifications, use the allversions
environment instead.)
Just as for SLIT E X, one can output selected slides or notes. This is useful
during development of the slide show, when one may spend much time
designing a complicated slide and is constantly processing it to see the
results; this can become tediously slow if the other, completed, slides are
also complicated or include large graphics files. As for SLIT E X (page 327),
the \onlyslides{list} command in the preamble ensures that only those
slides whose numbers are included in list are processed. However, there
is also a \notslides{list} command to exclude those slides in list.