use MPICH on linux

Setup environment (assuming csh or tcsh)
setenv PATH mpi_install_dim/bin:$PATH

Setup ssh:
1. Setup host authentication (by administrator), following two files are relevant. See ssh manual page for detail.
/etc/ssh/ssh_known_hosts
/etc/ssh/ssh_host_rsa_key

2. Setup user authentication (by user)
ssh-keygen -b 1024 -t rsa
cp .ssh/is_rsa.pub .ssh/authorized_keys

If ssh is setup correctly, following command should be able to run without entering password:
ssh remosthostname date