Running ssh
For every client machine you make a key, to do this by running
ssh-keygen, that is when you enter your passphrase and
stuff. After that all you have to do is go to every host you want
to be able to access from that client, make a directory called .ssh
and put the file that resides in .ssh/identity.pub on the client
machine into .ssh/authorized_keys on the host machine. There ya
go, it should work now. BTW - You should also make a .shosts file
on the host machine for added security, you can't use it to login
without the passphrase, however it will boost security as sort of
a personal access control list.