OHP用スタイルファイル
  seminar.sty is a LaTeX document style for typesetting slides or
  transparencies, and accompanying notes. It has many advantages over
  SliTeX. Here are some of the style's special features:
   *  It is a LaTeX style, rather than another format.
   *  It is compatible with AmS-LaTeX.
   *  You can use any fonts that work with LaTeX, including PostScript
      fonts and AmSFonts.
   *  Slides can be landscape and portrait within the same file.
   *  Color is supported through PostScript.
   *  The slides can have a frame and a colored background.
   *  The magnification can be changed with a single command.
   *  Overlays can be produced from a single slide environment.
   *  Accompanying notes, such as the text of a presentation, can be put
      outside the slide environments. The slides, notes or both together
      can then be typeset in a variety of formats.
  Some of these features require a PostScript output device.