\opt{text}{The following example}\opt{note}{This slide}%
 shows some examples for optional text (optional package)

\begin{skbmodememoir}Only with memoir\end{skbmodememoir}

\opt{anim}{\skbfigure[multiinclude=+-]{myfigure}}
\opt{noanim}{\skbfigure[width=\textwidth]{myfigure}}