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 Ă˜portrait 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: