and we have not done an explicit 'cvs login', then use a default password
of "anoncvs". This allows things like:
setenv CVSROOT :pserver:anoncvs@anoncvs.freebsd.org:/cvs
cvs checkout src (without doing the normal 'cvs login' for pserver mode)
but this runs over the :pserver: protocol rather than the more troublesome
rsh. Naturally, the server had better be running in -R (readonly) mode :-)