\Header{S4R}{R compatibility with S version 4/S-Plus 5+ support functions}
\alias{ErrorClass}{S4R}
\alias{usingR}{S4R}
\keyword{internal}{S4R}
\begin{Description}\relax
These objects ease the task of porting functions into R
from S Version 4 and S-Plus 5.0 and later.  See the documentation
of the lower-case functions there. May be obsolete in the future.\end{Description}
\begin{Usage}
\begin{verbatim}
usingR(major, minor)
\end{verbatim}
\end{Usage}

