The name mpich is derived from MPI and Chameleon; Chameleon both because mpich can run (adapt its color) on a wide range of environments and because the initial implementation of mpich used the Chameleon [14] message-passing portability system. Mpich is pronounced ``Em Pee Eye See Aych,'' not ``Emm Pitch.'' The proper references for mpich are the paper in the journal Parallel Computing [10] and this manual [9]. BibTeX versions of these citations are available at www.mcs.anl.gov/mpi/mpich1/mpich-prefer-ref.html.