\section{Introduction}
This user manual accompanies the software implementing
a new hybrid algorithm for computing the $l_2$ norm of
a real or complex $n$-vector which is described in the
article~\cite{Hanson:2015:RAC}.

Section~\ref{sec:Testing}
contains detail of the individual tests that form part
of the comprehensive test suite which is suitable for testing any set of routines with the same structure as the BLAS Level-1 \nrm routines.
A benchmark program
that compares the performance of competing algorithms
and implementations from both a timing and an accuracy
viewpoint is described in Section~\ref{sec:BenchMark}.

In Sections~\ref{sec:FileStructure} and~\ref{sec:Makefiles}
we describe the structure and contents of the files
which make up the software package and the accompanying
makefiles. Finally in Section~\ref{sec:Update} we provide
details of the changes needed

\begin{enumerate}
\item to add new tests to the test suite, and
\item to allow a new implementation of the $l_2$
norm routines to be tested against the test suite and
benchmarked against the proposed hybrid code.

\end{enumerate}
