Log in to the machine where you will run your simulations (presumably idra).
First, to make sure that cvs will use a secure method to communicate over the network, set the environment variable CVS_RSH=ssh.
If you are using the bourne shell, use:
export CVS_RSH=ssh
If you are using the tcsh:
setenv CVS_RSH ssh
You will likely want set the environment variable in your .cshrc (or .bashrc) file so that it will always be set on startup.
At unix prompt, type:
cvs -d physserv:/net/dogwood/1/cvsrep/flash/ checkout FLASH2.2
You can substitute "physserv" with any machine that you have an account on and that can see dogwood over the network. CVS should prompt you for your password on that machine and then create a directory called FLASH2.2 containing all of the source code and supporting files.