\documentclass[a4,notitlepage]{seminar}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\newcommand{\strongemph}[1]{\textbf{#1}}
\newcommand{\litfmt}[1]{\texttt{#1}}
\title{slide test}
\author{somebody}
\date{??.??.????}
\newpagestyle{slidepage}
{\hfill{}slide test\hfill{}}{\hfill{}somebody ??.??.????\hfill{}}
\begin{document}
\slidepagestyle{slidepage}

\begin{slide}
This is a slide.

\begin{itemize}
\item markup should work ordinarily.
\item nothing special here, either.

\end{itemize}
\end{slide}
\begin{slide}
\section*{Important points}

This is the second slide.

\end{slide}\end{document}
