Landscape and portrait slides

"seminar.sty" is a LATEX (or AMS-LATEX) document style. Thus, begin your document with
  \documentstyle{seminar}
The slide environments areslideslide*
  \begin{slide}    ...    \end{slide}
  \begin{slide*}   ...    \end{slide*}
slide is for landscape slides and slide* is for portrait slides. By default, the document is typeset in landscape mode, but if you include the Øportrait style option, the document is typeset in portrait mode. Typesetting the document in landscape mode is different from printing it in landscape mode; you may have to take care of the latter when printing with your dvi driver (see Appendix [*]). If you have both landscape and portrait slides in your file, there are two ways to print the slides: